![]() It goes in the throttle body slowly, then dump the last 1/3 can in till the engine stalls. You can get a quart of GM Top Engine Cleaner. Mileage should decrease for that tank, then increase to more than the decrease on the following tank. You can add a quart of Marvel Mystery Oil to a full tank of gas. How is the truck used? If it is a work truck that carries a lot of gear, weight reduces mileage. And, at the 10-15MPG range gaining 1MPG is the same as saving 12 cents per gallon, so don't be afraid to spend 2-3 cents a gallon more for the same octane, if you get better mileage. For example, my 96 Tahoe gets 2MPG better off Shell than anything else in my area, but the wife's 89 GMC Jimmy S15 gets the same regardless of brand. ![]() ![]() Yes, it all comes from the same place, but the different brands have different additive packages. What kind of gas do you use? Different vehicles burn different brands with different results. Let's do this cheapest to most expensive: My 96 3/4 extd cab 4x4 with 265/75/16 tires is getting 7 mpg with the heat and ac going. George wrote:what kind of gas mileage is everyone getting? with a vortec 454?
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