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| D2 - Fuel and Exhausts Everything to do with getting fuel into the engine, and fumes back out again |
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#11
19th February 2015, 08:56 PM
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Interesting.
All i will say is that some of the higher octane branded fuels are boosted with ethanol in order to achieve the higher octane rating. Optimal stoichiometric air-fuel ratio as we know is 14.7 part air to 1 part petrol. Stoic for ethanol is 9:1. Obviously running marginal ethanol in the mix is going to have a negative effect on MPG Vs a pure 98 Octane petrol with lambda set to get as close to 1 as you will see on the MOT or what that translates to = 14.7. 
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