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Showing results for tags 'poor mpg'.
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Hello, I have a 2001 Chevy Silverado 2500HD, It has a 5.3L V8 Vortec engine with 288,000 miles on it. It has 265/75/R16 AT tires, Things that are original include 6/8 ignition coils, MAF sensor, fuel injectors, serpentine belt, ect sensor (ive heard of problems?) Things that have been done to the truck since I got it include Radiator and water pump, hoses, heater hoses, Spark plugs and wires, fuel pump and O2’s in October 2017. 2 new ignition coils (The other 6 are stock) Oil changes/new air filters, Valve cover gaskets, (Used Throttle body cleaner and MAF cleaner about 1.5 years ago) When I 1st bought the truck in late 2016 was getting around 13-15 hwy which was good for me at the time. About 6 months in, the fuel economy started to decline, though it was not overly concerning to me yet, but within the last 6 months (around September of 2019) it took a hard hit. What was a decent economy, I only get 9 or 10 miles a gallon on the freeway, and don’t even get me started about the atrocity that is city driving. However, I have noticed that my Long-Term Fuel Trim on both banks is anywhere from 14-18% no matter when I check it, hot or cold, idling or at 2000RPM. No one has been able to give me any direction on how to recover any mpg's so far. I use the truck for work daily, I do a lot of driving, but still, it shouldn’t be so low! I just need some guidance here, as to where to (re)start as for fixing this thing. Thank you so so much if anyone has any types of input. Please help! somebody! Thank you
