Mechanics

MPG AND RANGE ARE NOT BEING PROPERLY CALCULATED

1994 Cadillac Deville • 21,300 miles

The display shows 23.0 mpg and the range displayed far exceeds what it should.
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Hendrix1
May 1, 2012.



Is your speedometer working correctly?

Roy

Yes, and the amount of fuel being used and left in the tank both appear to be correct

Tiny
Hendrix1
May 2, 2012.
I had a new fuel sending unit installed a couple of weeks ago. But the range and mpg are still not working properly.

Tiny
Hendrix1
May 2, 2012.
Then if all else is working the module may have failed.

It may not be available anymore. Call your local gm dealer and give them your vin number and see.

Roy

This is controled by the ecm. What is the range when it read 2 gal.

Cadieman
May 4, 2012.