I just got my 04 grand prix in may of this year, it has a series III 3800 not s/c it has 83000 km (80,000 when i got her) and i am not impressed with my fuel milage. I have changed the filter and cleaned injectors,but only helped a little,need tips before i pull out the rest of my hair. I am also lookin for a throttle body spacer to no avail ps love the car though
It would help to understand what mileage you are currently getting and what you are expecting to get for MPG with your '04.
I am getting 24 mpg in the city, 30 mpg on the highway with my '04 GT1.
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mark
'04 GP GT1
'98 GTP
'98 GTP 4dr - Project car (newly acquired)
'99 GP "Flaming Tomato" GT