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Re: Which petrol is best, 91 or 95 RON
as a rule better fuel economy comes from higher fuel density.
Ethanol increases octane rating, but has less calorific value, therefore even if the engine can exploit the octane rating increase fully, you are going to see a increase in fuel consumption.
In most modern engines, the management system can adjust the settings, running a PULP will give you more power and torque and better fuel economy.
I personally stay away from ethanol anything and run 95-98 PULP.
In my car I get best fuel economy from Synergy 8000 and caltex vortex 98 then BP ultimate 98. Synergy 6000 - 96 gives me about the same as BP ultimate 98.
Some of the additives in PULP like toluene and benzene will add oxygen to the combustion process and cause your o2 sensor lean off or enrich you car. That and fuel density is why there is a variance between fuel companies, often by running leaner, you can get more HP out of a petrol engine. But running too lean will increase piston temperatures etc.
Just like diesels run lean, ie below stoichiometric ratios, petrol's tend to run rich. In both engines it keeps the combustion process cooler and is a more conservative default setting.
as a rule better fuel economy comes from higher fuel density.
Ethanol increases octane rating, but has less calorific value, therefore even if the engine can exploit the octane rating increase fully, you are going to see a increase in fuel consumption.
In most modern engines, the management system can adjust the settings, running a PULP will give you more power and torque and better fuel economy.
I personally stay away from ethanol anything and run 95-98 PULP.
In my car I get best fuel economy from Synergy 8000 and caltex vortex 98 then BP ultimate 98. Synergy 6000 - 96 gives me about the same as BP ultimate 98.
Some of the additives in PULP like toluene and benzene will add oxygen to the combustion process and cause your o2 sensor lean off or enrich you car. That and fuel density is why there is a variance between fuel companies, often by running leaner, you can get more HP out of a petrol engine. But running too lean will increase piston temperatures etc.
Just like diesels run lean, ie below stoichiometric ratios, petrol's tend to run rich. In both engines it keeps the combustion process cooler and is a more conservative default setting.
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