Given the car is in the highest gear, at approximately what speed is it most fuel efficient?

Question:
I'm sure it depends of type of car, so lets use a Mazda3 as an example...though the basic concept/principal is more important.

Answers:

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It depends on the gearing of the vehicle, its aerodynamic efficiency, and a lot of other factors regarding how well the engine burns fuel. Road cars are generally designed to be most efficient around 40-50 mph. Above that wind resistance drives fuel economy down quickly.

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General rule of thumb: 2 X the speed takes 8 X the gas.
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I'm don't know about the masda3 but there is a car that gets 113 miles to the gallon and the top speed is 205mph i don't know the name of the vehical.

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cars are designed to give off the least pollutants and get the best fuel economy at 60mph

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60 m.p.h. I read this in a car and driver magazine.

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Whatever speed it is set to be efficient at. Often they will be around 65 MPH since that is the speed limit on a great number of highways.

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Each engine manufacturer should have the specs but they may be just fiction to sell the buyer. The best test method would be to run the car on a fixed quantity of fuel at varying speeds to determine which speed gives the most distance.

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At a guess, the Mazda3 will probably do best around 60 mph, 100 km/h

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Around 50MPH

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A 4 cyl with a 5 speed would benefit best from an engine speed of
anout 2300-2500 rpms, this usually equates to about 60-70mph.
(depending on the gearing of the trans and tire circumference)

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