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What is the most fuel efficient speed to drive at?

i have a 1994 Ford Fiesta if that makes any difference. i just want to know what speed to drive at to use the least fuel most efficiently.

Public Comments

1. Right around 45mph....that is what auto makers use as their "highway" when they say how many miles per gallon highway the car gets
2. anything over 60 miles per hour and youll be getting worse mph, but dont bog it down either, try to keep your rpm's around 2000
3. It depends mostly on the vehicle, gearing and engine. You want the lowest possible RPM's at the highest speed while keeping the torque converter locked which is usually over 45MPH.
4. Zero. Especially if you also turn off the engine.
5. Thirty five if you have to go somewhere, in the highest gear. This may be hard on the engine, most certainly on a up grade.
6. 110mph
7. anywhere between 1,000 and 2,000 rpms. my biggest gas hog(98 dodge dakota 5.2 v8) gets the best mpg at about 55mph thats around 1500-1,800rpm.
8. Drive in the top gear between 35 and 75 MPH and find the point at which your RPM will not go any lower or bog. Optimal is about 2000 RPM.