How fast should I go to save gas?

talent4god asked:


I hear that you should not drive like a nutt to save gas .. but what is considered to be decent MPH while driving? is it 40,50, 55 MPH?

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6 responses to “How fast should I go to save gas?”

  1. t. B

    The number you want is not speed. After 65% of power you are using more fuel to cool the cylinders than you burn to produce power. As the trasnmission goes through the gears the % of power changes. Ex. 30 mph in 1st gear may be 80% of power in 2nd gear it may be 60% of power and in 3rd gear 15% of power. your fuel efficency is determined by the engine speed (rpm) not your road speed (mph).

  2. mdcbert

    I`ve always heard it was 35-40, but now with lockup torque converters it could be 50

    If it`s diesel, put it in 5th gear as soon as you can. Diesels put out all their torque really low in the powerband, so the revs are lower, and the mileage is a lot better.

    also mashing down on the gas pedal uses a lot of gas too, Block your gas pedal from accelerating more than Grandpa speed. I said acceleration NOT top speed. Average midsize light cars only need 12HP (yes twelve) to cruise along at 55mph. I put a stop on my K-cars` gas pedal to not go down more than a bit off of idle. The engine will rev fully when in Neutral, and I just kinda hold the auto trans down a gear when I am going up the on ramp of the freeway, and shift to D when I get to 50mph.

    With my little mod, I went from 23mpg, to 30mpg!

    next I`m putting a diesel engine in it, a Kubota 22hp 3cyl.

  3. Gerald

    To save gas drive only when necessary. To save gas drive the speed limit or under. Have to stay with the flow of traffic. But not speeding. Don’t tell—to save gas ride with your friends– let them drive…

  4. ronnie b

    55 miles per hour saves the most gas

  5. Mikhail A

    While each vehicle reaches its optimal fuel economy at a different speed (or range of speeds), gas mileage usually decreases rapidly at speeds above 60 mph.

    As a rule of thumb, you can assume that each 5 mph you drive over 60 mph is like paying an additional $0.20 per gallon for gas.

    Observing the speed limit is also safer.

    Aggressive driving (speeding, rapid acceleration and braking) wastes gas. It can lower your gas mileage by 33 percent at highway speeds and by 5 percent around town

  6. UCANTCME

    55 TO 60 WITH OVERDRIVE AND RPM’S AT 1800

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