Why doenst my average mpg on my '04 Chevy 2500HD change? Its like the onboard computer averager doesnt work.?

Question

The informaiton center in the console under the speedo is what i am refering to when i say onboard computer.

Answer 1

You have to reset it.  just like you do your mileage on the trip odometer.  And fuel used.

Otherwise it's been calculating your average fuel mileage since you last reset it.  That would be why it doesn't change.

Answer 2

i agree with the previous answer. if you havent reset the DIC in a long while, the average will take extreme mileage differences over a long period of time to affect it. reset the avg on the DIC and you should see immediate changes. Once you have reset it and still nothing changes.... time to go see Mr. Goodwrench.