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  • #31
    Re: Diesel Fuel Economy

    G'day Gav, While I haven't done the figures properly I don't think we did too much better towing our 17 ft Kedron on our (mutual) recent trip to Cania Gorge with the 120 series D4D. I sometimes wonder about diesel fuel these days...

    Don't stress too much mate, it might settle down.

    Sunday
    PS: The Cania Gorge trip was the best fun we've had in ages!
    [color=#0080FF]Having reached my 40s I finally know what I want to be when I grow up: a Grey Nomad!

    2006 GXL D4D Auto with Kedron XC (Cross Country) Caravan [/color]

    Comment


    • #32
      Re: Diesel Fuel Economy

      Just back from 10500 Melb to Cape york
      150 GX Auto T/D.
      No trailer, just very full car. Air always on Recirc.
      Averaged 9.4 L/100 KMS.
      Funnily as soon as we crossed QLD border started to use more fuel.
      When coming back, when leaving QLD we started to use less fuel.
      We wondered whether the air was heavier with the humidity but that usually makes a Petrol Engine work better?
      Leighland.

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      • #33
        Re: Diesel Fuel Economy

        Originally posted by leighland
        Just back from 10500 Melb to Cape york
        150 GX Auto T/D.
        No trailer, just very full car. Air always on Recirc.
        Averaged 9.4 L/100 KMS.
        Funnily as soon as we crossed QLD border started to use more fuel.
        When coming back, when leaving QLD we started to use less fuel.
        We wondered whether the air was heavier with the humidity but that usually makes a Petrol Engine work better?
        Leighland.
        going into QLD you're going uphill the whole way

        heading home it's downlhill :mrgreen:
        Dan - Prado 150 GXL - now for sale

        Comment


        • #34
          Re: Diesel Fuel Economy

          Seriously though: I wonder if the crap quality of our roads here in Qld makes a difference to fuel economy? Typical "highways" suffer badly from subsidence, patches upon patches in the (narrow) bitumen etc., few overtaking lanes all collectively adding up to being difficult to maintain smooth driving techniques.

          Sunday
          [color=#0080FF]Having reached my 40s I finally know what I want to be when I grow up: a Grey Nomad!

          2006 GXL D4D Auto with Kedron XC (Cross Country) Caravan [/color]

          Comment


          • #35
            Re: Diesel Fuel Economy

            maybe the warmer temperatures have something to do with it. ie petrol turbo cars especially love cold denser air. engine may not be as efficient, not sure if that applies to turbo diesel cars as they don`t rely on the right air fuel ratio.

            may also be a tyre issue as the tyre gets warmer more flex >> more rolling resistance.
            It appeared to me that tyre wear rate increased when travelling up north compared to down here, that may be due to increased load, average higher speed, road surface and temp related. Sand or dust on the road ie sandpaper affect ?????????
            stepped up the a 200 LC for towing,
            but had a 2012 and 2010 150 Prado GXL auto diesel in Graphite with Bridgestone D697 A/T. Dobinson C59-300/325 and Bilsteins. Accessories : two baby seats. Sidewinder`s Dual Battery isolator and rear power outlet kit. Pirana Battery tray, Hayman Reese towbar with Toyota wiring kit and Brains`s guard.

            Comment


            • #36
              Re: Diesel Fuel Economy

              Originally posted by Derb
              Hi Fellas. I am seeing some pretty mean fuel consumption figures on this page. The Toyota trip computers are notoriously inaccurate for fuel figures. My father-In-Law brought a new Sportivo and his was around 8% out on a long trip. The dealer stated that they (Toyota) were comfortable with anything under 10% and the fuel computer was only a rough indication. I think this is pure B_____llS___t. The only way to get accurate fuel figures is to fill the tank(s) to the brim yourself, (take the time to do this completely - not just the first glug) set the trip meter, run the car/Prado to the orange light and fill again. Do the math and compare with the fuel computer - have a reality check! You may be shocked. Cheers, Derb.
              Hi Derb. I have double checked the mileage by manually calculating each time I fill (km done against litres used), on every single fill since new. Thats about 10 fills over the 16,000 km I have done. The overall fuel consumption of 9.1l per 100km as per the trip computer is 100% accurate in my case.......
              Graphite D4D Kakadu. ARB Sahara Bar, IPF Lights, Chipped (Tunit), GME TX 3340. Dual Battery System with REDARC Isolator. Safari Snorkel. ARB Fridge, TPMS....

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              • #37
                Re: Diesel Fuel Economy

                Picked a new D4D Manual up yesterday;
                Predelivery mileage showed 11km, duration 47mins and 30.7l/100km (obviously idled a long time in the workshop).
                As at this morning, 46km (50/50 expressway/off-peak traffic), duration 1 hour 17minutes, consumption down to 11.3l/100km
                Assuming Toyota's consumption figures are as accurate as Nissan, I'm hoping the average to settle somewhere around 10.1l/100km before any accessories are fitted.
                D4D (150 Series) GXL Manual in Silver Pearl,ARB Bullbar, Dual Battery, Towbar, Anderson Aux. Power to Towbar, ABR Sidewinder Compressor, ABR Battery Monitor, Lightforce Driving Lights, ProRack xTreme Roof Bars, PP sticker, (mudflap upgrade now on order)
                Intended Use: Touring with Comp. Tinnie (Camper Trailer now for sale)

                Comment


                • #38
                  Re: Diesel Fuel Economy

                  Has anyone been able to get an answer from Toyota as to where the last 20lt went from the fuel tank? I have run it down to less than 10km on the computer with the fuel gauge on empty and I can still only get 129lt in on a refuel. It seems strange that there would be 20lt left in reserve as this would get me 200km further range.

                  Over all I am getting 9.2l per 100km so I am happy with the consumption, but would still like a full 1500km range.
                  Stephen Bloomer
                  I did have - 2010 GXL D4D Auto, ARB bullbar, rails, sliders, winch, 40mm lift, Brown Davis bash plates and long range tank

                  Comment


                  • #39
                    Re: Diesel Fuel Economy

                    Originally posted by smakb
                    Has anyone been able to get an answer from Toyota as to where the last 20lt went from the fuel tank? I have run it down to less than 10km on the computer with the fuel gauge on empty and I can still only get 129lt in on a refuel. It seems strange that there would be 20lt left in reserve as this would get me 200km further range.

                    Over all I am getting 9.2l per 100km so I am happy with the consumption, but would still like a full 1500km range.
                    Just did a trip to Qld from the ACT. 4 industrial sized passengers, and the luggage compartment stacked to capacity. Averaged 9.0 L/100Km for the 3700Kms covered checked pump litres to KM on ODO and within 0.1 on the computer.

                    As to where the other 20l went, the answer as I understand it is that the use of pressure to support common rail injection requires that a reservoir of fuel be available to maintain pressure and return flow, and that the heat generated needs some additional fuel (reservoir) to dissipate to stop vaporisation.

                    I ran to 60Km cruising range as per the computer, and filled up 129 litres. I think if you had to you could easily exceed the cruising range shown on the trip computer, but you risk running out of fuel finding out how far, and the inconvenience of bleeding the fuel system if you do. (I haven't looked at the manual I have just assumed the system is not self priming). Seriously though, if you are planning trips that extreme I would recommend that you consider carrying additional fuel anyway. I appreciate that it should be possible to use all of the fuel in the tank, and within a couple of litres it is probably possible to do so, but I would not want to be relying on that alone for my survival in the outback. I scuba dive, and with tanks that hold 230 Bar, when diving deeper than the recreational limits, we allow 33% for getting down and doing the dive, 33% for the ascent, and the remainder as contingency. If it was me planning a trip into remote country, I would look to do something similar with fuel and water.

                    Toyota has a duty of care not to let some nuff nuff end up stranded in the middle of nowhere, so in our litigious society, I also assume that they have taken a risk management approach on the basis that understating remaining range allows for encountering terrain that substantially increased fuel consumption. This avoids the scenario where the gung ho tourist hires a prado, decides to drive into a nice remote location after floods, plans to get fuel 1300km into the trip and then finds him/herself in a 200Km mud bath a 1000K's out.

                    If you are really serious about getting the maximum range then you should consider an aftermarket flow meter and test the actual effective capacity of the tank, and relay on recorded fuel consumption by terrain to really eke out the maximum. Personally, I am happy to have a safety margin in place, although it is also frustrating for a techo not to have hard details to do the calculations.

                    We managed 1300K's before the fuel light came on, and that was punting along at 110-115 Kmh as per GPS. All up not too bad considering the weight and speed involved

                    Comment


                    • #40
                      Re: Diesel Fuel Economy

                      It is interesting to check you speedo at say 100km against a GPS - regardless of standard or after market tyres. Even with aftermarket tyres I notice that the toyota speedo on the gxl overstates your speed slightly - so presume same or worse with stock tyres. This will obviously change real figures if you are trying to be exactly spot on.

                      I have noticed some variances between computer and the pump fill - up to nearly 1lt maybe - however have also noticed that I need to be conscious of consistently using a fastflow or standard pump and standing around trying to get the most in it - so not sure about that issue just yet.

                      At 3000km fuel maybe starting to come down a bit - however first 3000km auto diesel town/freeway mix seems to be between 10.9 and 11.5. Have reset the computer and see how we go next fill - hopefully get a fraction better as it runs in.

                      Cheers Tim
                      2010 GXL Diesel Auto White, Goodyear Silent Armor, Toyota towbar, Tint, Ausguard Cargo Barrier, Wetseat covers - 2nd Battery yet to be fitted

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                      • #41
                        Re: Diesel Fuel Economy

                        OK truck 1 now has 8000 klm and on a weekend trip from Clunes to Frankston averaged 7.4l / 100klm. Highway all the way however through the city, westgate nightmare, citylink etc so pretty pleased with that.

                        Truck 2 still under 2000klm but down to around 8.6 now.

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                        • #42
                          Re: Diesel Fuel Economy

                          Originally posted by XWGT
                          OK truck 1 now has 8000 klm and on a weekend trip from Clunes to Frankston averaged 7.4l / 100klm. Highway all the way however through the city, westgate nightmare, citylink etc so pretty pleased with that.

                          Truck 2 still under 2000klm but down to around 8.6 now.
                          are these calculated after filling, or from the computer?
                          Dan - Prado 150 GXL - now for sale

                          Comment


                          • #43
                            Re: Diesel Fuel Economy

                            From the trip computer, however have all the receipts for fuel and intend to calc it up at the 10,000k mark. It looks pretty close to the mark at the moment.

                            Comment


                            • #44
                              Re: Diesel Fuel Economy

                              Just a note to say I have been to the Cape and back with a couple of the 120 series Prados, one with a trailer. Interesting to note that when off road, using low range (Old Telegraph Road) I was getting 14 to 16t l/100ks with the Prado 150, and the 120 with a trailer was getting 16-18. The other Prado 120 did not have instrumentation for fuel economy.

                              The trip home was on sealed roads, fully loaded roof rack and I still got 10.2 l/100kms (Cairns to Brisbane). That is sitting on the speed limit (100 in 100 zone and 110 in 110 zone). Considering I have a winch, bar, 265/70/17 BFGs, two inch lift kit and 80kgs on the roof rack (looked like a barn door) - not bad.

                              So much for the increased fuel economy as my mate had a 120 series, same lift kit, tyres and a genuine alloy bar. He also has a roof rack which was not quite as much as mine but he did get the same fuel economy. The difference being he had an additional 30 litres in the tank.

                              Looks like I dropped at least 1 litre per 100kms for the lift kit/higher profile tyres and a bit more for the bar/winch.

                              Nifty...

                              Comment


                              • #45
                                Re: Diesel Fuel Economy

                                I just measured my 120 series diesel economy over the past week and a bit.
                                1306kms for 134 litres of fuel. (about 10.3l per 100km)
                                This was mainly commuting in "fastish" traffic (80km/h limit) with 250kms of freeway work.
                                I have accessories and specs as per sig below, and my tyres are at 44psi front and 42psi rear. They are only a couple of weeks old.

                                I was starting to think that the economy had dropped off a bit from when I bought it last November. I have been proved wrong...... again.
                                2008 Diesel Prado with extra stuff added. I drive it on the road and other places too.

                                Comment

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