Sudden MPG increase

It's usually a worm gear on the output shaft of the transmission.

The ABS encoders, as far as I know, are only used for ABS purposes. If they're also used for determining MPH, then the ECM would need to do averaging since there are multiple encoders and they spin @ different speeds when turning.

Regardless, the point we're both making is that you have several variables that are each a functiion of both speed and fuel use in order to arrive at the final MPG number. The car is incapable of knowing fuel used/miles traveled.

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Originally Posted by SJAndrew

It's usually a worm gear on the output shaft of the transmission.

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Huh? So, you're telling me it's not the wheel speed sensors? That when someone puts huge rims on their car and the speedo is waaaay off, it's got nothing to do with the wheel speed sensors?

wheel speed sensors aren't used for the speedo.

VSS sensor near the diff is.

Well damn. I'm learning! And they said it couldn't be done!

also wheel speed sensors have alot to do with abs as well.

without all of the wheel sensors working, abs can't operate.

read:

ABS and Big Brake Kits