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I seem to be getting less mpg now it's turned colder. Mines dropped from high 30's to mid 30's - 35 mpg last time I checked. Anyone else seeing a drop to match the change in temperature?
Fuel economy drops when temp drops because your engine starts burning fuel more efficiently, colder intake air = better combustion burn means all the fuel will be burnt each cycle. This means that the lambder sensor reads lean and it prefers to read rich to keep the engine safe from detonation. So all this means that the ECU adds extra fuel to each burn to ensure the engine stays within safe stoichemetric (efficent burn) limits.
I've been averaging (according to the trip computer) 36-38mpg but it's been averaging 34mpg for the last few tankfuls, for similar driving conditions/styles.
Bloody excellent for having such performance though