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increases (e.g. wind resistance or drag at 100 mph is not twice that of 50 mph). Its way more than twice (one of you physics dudes should know the formula for a car-sized object). So yeah, a 10 mph speed increase at higher speeds generates significantly more drag than it would at lower speeds (sub 50 mph speeds) causing increased drag and thus fuel consumption. : but something that all you folks interested in MPG etc. might like to see. : Trip was 1,980 miles total, and included 2 passengers and baggage for a week, guessing about 550lb. : Consumed 85.91 gal. for a 23.04 mpg total trip average. Gas average cost was $1.649/gal for making a .07157 per mile fuel cost. : Lowest gas cost was $1.599 (Fl), highest was $1.739 (SC) : Best single tank was 25.24, running interstate at 70ish on cruise. While the AC was off, Ttops were out, which I suspect the turbulance might have hampered total mpg some. : Worst tank was 21.01 which was a mix of mountain roads with some 'spirited' driving and a couple of hundred miles of interstate at 80 with the AC on. : While we all know that AC off/on has some impact, and that actual travel speed has some impact, I have noticed (over several trips like this) that speed is the BIGGEST factor for my car. Under like conditions, cruising at 80 looses 2 mpg over cruising at 73. : Almost 10% fuel savings for 7 mph is pretty significant. I have added headers and dual exhaust to old V8 cars and only improved 10% in road mileage. : My educated guess is that with the NA gearing the 'sweet spot' for the engine effiency is about 2500 RPM.
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