Quote:
Originally Posted by drmiller100
The faster you accelerate, the more time you spend at "top speed", which means you burn more fuel simply because you are going faster.
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In my case this represents perhaps 1 km over a 100 km one-way route, so the effect on overall would be perhaps 1% if this was simply a geometric effect.
Looking at the instantaneous gauge, mpg goes from about 65 cruising at hiway speed, to about 15 to 20 mph during acceleration.
Quote:
Originally Posted by drmiller100
Second, the ECU computer in the car richens the mixture drastically above a certain point. It goes "open loop" and throws gas at the engine, because extra gasoline gives more power. You REALLY want to stay out of "open loop" for mileage.
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Ahhhh, now *that* sounds like we might have hit on it...
Quote:
Originally Posted by drmiller100
Third, an automatic transmission will stay in low gears longer, meaning more average RPM's, which means more gasoline burned.
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Is this purely linear? IE, is 2x RPM and 1/2x the gearing to get the same end speed using twice as much fuel?
Maury