Bad MPG

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Oct 21, 2007 | 07:41 AM

Kokee

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New User

Joined: Jul 2007

Posts: 19

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From: St. louis area

Bad MPG

I need help on this problem I'm havin with a rebuilt motor. Runs great, idles smooth, timing is right, but I'm getting about 7.0 MPG now when it used to be around 12 with the old motor.
Could the speedometer cable going bad be responsible for the difference or is the odometer accurate even if the speedometer is flucuating wildly when I'm driving.
I'm going to change the O2 sensor, plugs and wires, but I can't afford to drive around at 7.0 MPG

Oct 21, 2007 | 08:41 AM

JLDickmon

Elder User

Joined: Sep 2007

Posts: 624

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From: Kalamazoo, MI

your new engine is probably "tight"
requiring more horsepower to turn.

it should gradually get better on it's own

Oct 21, 2007 | 12:49 PM

godblessmud

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Joined: Jul 2007

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what engine anyways?

Oct 21, 2007 | 02:01 PM

andym

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Joined: Mar 2002

Posts: 19,402

Likes: 38

From: Bonita Springs FL

If the speedometer is wrong, the miles driven will be wrong too. You need an accurate measurement of how far you've driven in order to calculate MPG.

Oct 21, 2007 | 03:52 PM

ACarbone624

Senior User

Joined: Mar 2007

Posts: 279

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From: Vineland, New Jersey

Like JLDickmon said.....Usually with new vehicles, the MPG gets better as the engine breaks in....so being your motor is "tight", it may get better as time passes.

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