Re: 10 MPG! Please help! 95 4.9 deville concourse
If mine would at least get 12.5 i'd be happy, . I'd change the plugs and deal with it. But 10 is jus too low . I might as well put a 455 in my cutlass and drive it daily if ill setle with 10 mpg. But I did have some history codes, I'll check in the morning and post. Thanks to all.
And by the way, it actually has dropped all the way to 8 mpg, i just reset the trip,average,and instant about 3 weeks ago got on the interstate and let it average out to 18mpg, not even a good 15 min of stop n go street driving it went to around 11.4. Parked for the night, went bout 1/2 a mile to the store and it dropped to 10.4 and has been that way ever since.