Quote:
Originally Posted by ThermionicScott
Miles Per Gallon is the measure of how far a vehicle can travel on a gallon of fuel. How much power the engine makes is not relevant as long as it can move the vehicle.
I disagree, it takes a certain amount of HP to move the car, over coming wind, tire, internal friction ETC. to maintain a set speed.
SO IF that HP can be made with less fuel, then you get more MPG.
There are many changes that can help, higher compression ratios, and a stroker crank making more torque could make more HP/torque with less fuel. or a more powerful fuel also.
Volumetric efficiency is helped (a little) by cooler air, but that hurts FE rather than helping it, by causing the engine to use more fuel at idle.
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As for idle I have two gauges that show the GPH at idle and hot or cold it uses the same .45 to .60 GPH depending on rather the A/C compressor is engaged.
AND idle has very little to do with MPG unless left idling for long times...
Rich