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How to improve (reduce) diesel usage

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  • #16
    Ok - this tank fill saw 125.93L for 925 km giving 13.61L/100km - compensating for larger tyres gives 13.2l/100km (for interest the trip computer for the period showed 13.3L/100km

    Whilst this is only fractionally better then last fill it is surprising as 220km was towing a lightly loaded trailer. perhaps the awning and rod tube added more wind resistance than i thought. Will leave it as is for this tank as car has been serviced today and will see if that makes a difference.

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    • #17
      I found a full length metal roof rack, even empty, added almost exactly 10% to the fuel usage, repeatable over many times..

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      • #18
        Roof racks eat fuel.
        Even the bars on mrs i30 are enough to make it feel like the handbrake is on.
        The biggest thing with her car was tyres.
        You can get " low rolling resistance" tyres for cars.
        I thought it was a story until I fitted Michelin's to it and the useless thing instantly used more fuel and lost pep.
        75,000k later I went back to the low resistance tyres and you'd think it was supercharged. Power is back as is economy.
        Downside is those tyres are as thin as paper, don't like rocks etc on our dirt road.

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        • #19
          OK - the latest in the most mundane thread on pradopoint.

          last tank fill was 129.9L for 965km giving 13.6L/100km, compensating for larger tyres gives 13.0l/100km so servicing has made no real difference.

          variable for this tank is that i will not drive the car faster then 90km/h

          My commute to work which makes up a significant amount of my kms is 19km each way with 15km being 100km/h zone so will be interesting to see what difference this makes.

          After this tank I will try not running the air con fora tank, however realistically i will only achieve this say 80% of the time as if the family is in the car its not going to happen.

          Following this i will try a wheel alignment and balance. My Tyres are not evenly worn thanks to doing a lot of towing last year with a camper with a high ball weight, but there is still heaps of tread so i cant justify new tyres yet.

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          • #20
            Mid refill update,

            going off the trip computer (where as the above is all from km's and refill volume) the reduction in fuel use is greater then expected, computer is showing 11.3L/100km

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            • #21
              And the testing continues.

              latest tank was was 66.48L for 536km giving 12.4L/100km, with compensation for larger tyres its 12L neat. trip computer was showing 11.3L/100km (reset at fill up) as a comparison

              I've got some towing to do coming up and the mother in law will be using the car for a bit so wont count next tank.

              Then I will try keeping the AC off as much as possible to see what difference that makes

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              • #22
                have you cleaned the MAP filter & MAF sensor yourself? do you know where they are

                2008 Dune D4D manual GXL update - with lots of fruit !! + Roma Razorback Off Road Van

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                • #23
                  I have cleaned the one on top of the airbox, but i dont know of another sensor that i can clean. what do you suggest?

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                  • #24
                    Originally posted by carco View Post
                    Roof rack eats fuel.
                    Larger diameter tyres too, you’ll notice a huge improvement back on standard tyres especially acceleration.
                    Finally do real sums. Your larger tyres will upset the odometer and factory speedo is also way out. Hard to compare apples to apples unless you level the playing field.
                    Ditto, on standard profile tyres I was getting 9.6-9.7L/100 since going up a profile to 265/70/17 I now make 11.3-11.7L/100.

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                    • #25
                      Originally posted by vf34 View Post

                      Ditto, on standard profile tyres I was getting 9.6-9.7L/100 since going up a profile to 265/70/17 I now make 11.3-11.7L/100.
                      There’s something else going on there. You won’t cop a 20% hit in fuel economy just from 265/65 to 265/70.
                      i did the same on my petrol, (265/65 ATs to 265/70 ATs)and was lucky to see a 5% hit..

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                      • #26
                        Originally posted by rascal View Post

                        There’s something else going on there. You won’t cop a 20% hit in fuel economy just from 265/65 to 265/70.
                        i did the same on my petrol, (265/65 ATs to 265/70 ATs)and was lucky to see a 5% hit..
                        Hi Rascal, that's all that I have changed in the past 6 months... hmmm... Use to have Dunlop AT25 265/60/18 then swapped out to standard 17" Prado rims with Yoko X-AT tyres 265/70/17.

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                        • #27
                          Going from the standard Dunlop AT25 265/65/18 construction & pattern to the larger, heavier and more aggressive X-AT will probably add closer to 10% I would think.
                          Weight and tread pattern both affect economy as well as the increased diameter, I believe the X-AT is also a "tall" 265/70 tyre as well as it is a 121 rated tyre.
                          I run a set of Yoko GO15 LT265/70/17 121 tyres which are 6 kg/ tyre heavier (35% heavier) and rotate about 5% less to achieve the same road speed as the standard Dunlops and they increased my consumption at least 5%, hard to be definite because I only briefly ran them unloaded. Mostly it was with a fully loaded roof rack out to Innamincka and surrounds so wind drag increased as well.

                          Are you sure you have 265/70/17's as the global Yokohama web site only lists then at 285/70/17 and up but the Aust site lists the 265/70/17 size, weird.

                          Lee
                          Last edited by Leethal; 30-03-2020, 10:41 AM. Reason: accuracy
                          02 VX, Toyota Alloy Bar, IPF 900XS with 50 watt HID, 50 mm Lift- Lovell Shocks n Springs, Safari Snorkel, large Pioneer tray, Pioneer In-dash, Alpine roof mount DVD screen -handled the Simpson and Innaminka roads, now with a little TRD blower & Unichip

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