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.
2007-03-03 14:50:05 · 8 answers · asked by MaxJerome 1 in Cars & Transportation ➔ Other - Cars & Transportation
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.
General rule of thumb: 2 X the speed takes 8 X the gas.
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2007-03-03 19:21:41 · answer #1 · answered by Anonymous · 1⤊ 0⤋
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.
At a guess, the Mazda3 will probably do best around 60 mph, 100 km/h
2007-03-03 23:00:10 · answer #2 · answered by St N 7 · 1⤊ 0⤋
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)
2007-03-04 01:22:49 · answer #3 · answered by tito_swave 4 · 0⤊ 0⤋
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.
2007-03-03 22:57:46 · answer #4 · answered by Inferno 2 · 0⤊ 0⤋
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.
2007-03-03 22:59:04 · answer #5 · answered by Anonymous · 1⤊ 1⤋
cars are designed to give off the least pollutants and get the best fuel economy at 60mph
2007-03-03 22:57:54 · answer #6 · answered by steven s 2 · 1⤊ 0⤋
60 m.p.h. I read this in a car and driver magazine.
2007-03-03 22:58:42 · answer #7 · answered by Jim C 6 · 1⤊ 0⤋
Around 50MPH
2007-03-03 23:06:35 · answer #8 · answered by The Cactus 2 · 1⤊ 0⤋