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99 GMC Jimmy fuel economy

drewcarr1drewcarr1 Posts: 2
edited April 2014 in GMC
I have a 99' GMC JIMMY with 150,000 mile. The milage has been crappy lately.I could drive about 5 miles and i can see a difference in the fuel guage. I had the dealership do the fuel injector service,I also had another mechanic change the o2 sensors since he said that would help the mileage.Is there any other part i can change to help my mileage. I know suv's burn more gas but i dont think i should be seeing a significant drop in my guage when i have only driven about 5 miles or so.

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