Quote:
Originally Posted by Isaac Zachary
Because of that there's a curve to your fuel mileage when cruising at a certain speed on flat ground. There'll be a speed that gets you your best fuel mileage. Faster or slower than that will get you worse fuel mileage.
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^THIS
Every vehicle will have a 'sweet spot' where it's most fuel efficient. The vehicle's aerodynamic efficiency will have a strong affect on that. The better the aero, the higher that sweet spot will be.