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Open windows create drag.
Those windows open also increase fatigue via wind noise, dust, pollen, vehicle exhaust, etc, being pumped thru the vehicle.
Being fresh and alert at the end of the trip counts for more than some tenths. Against the ANNUAL average mpg, what’s the penalty? 3/100’s of a cent?
HOW you use the vehicle will always come first. And I doubt anyone has dead-lowest usage charted except for a minimal period.
A car is about convenience. Designing one’s life so that ownership is NECESSARY is the problem.
What (in your use) would some further discipline gain in terms of fewer engine starts? (No one thinks twice about turning a light switch on or off. The car is a whole different set of penalties to turn on per convenience. You aren’t walking thru your home with a flashlight to avoid engaging the main, are you?).
Track the number of engine starts per per week. Isolate the cold ones (after four hours). And get Average MPH to a higher number.
A/C is a great tool. Keeps one from having to change clothes at each destination. Etc.
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