19KFX4

i know its a truck and gas is not great i understand that but mine is about 1mpg off than it was. i have a little over 36K on the truck 2" level, regular tires size, cold air intake and a canned tune from Sct. been running all for amost 6+months, have plugs that i put in when the truck had about 10k on it. the plugs are one cooler than stock, and gapped at 32. i run only 89 octane because my truck seems to get best on that. any help. thought about replacing the plugs again.

i also run an Ethanol stabilizer normally with every thank full and normally works well

THANKS ALL

Tothemax

Pull your plugs and see if they are still gapped correctly.

Mr.Bojangles

Check your plugs. I know you just replaced them but mine were changed around 12K miles at the dealer to the new ones and were all gaped at .034. When I pulled them at 24K miles to replace (didn't know they were already replaced) my gas mileage was getting worse and my idle was horrible. I re gapped to .030 and put them back in but it was still bad. I put my new ones in all gapped at .030 and this returned my gas mileage back to normal. So the Sp-534's in mine only lasted 12K miles before I needed to replace. Hopefully these new ones last a little longer.

19KFX4

yeah i was figuring is was the Gap in the plug or something