Drinking Gas

el Diablo · 2004-12-05T23:24:16+00:00

All thoughts welcome.My 1999 K1500 that has a 5.7 liter automatic transmission with a 3:42 rearratio has just recently started liking gas more than it usually does. I'vedropped from an average of 15 mpg to 13 mpg. Just sort of happened overnight. The truck has only 67,000 miles on it and other than the sudden gasusage seams to run fine.I'm going to borrow a friends code reader this coming week and see if thereare any hints in there. As far as I know the plugs and wires are original, Ireplaced the cap and rotor at 55,000 miles. I looked at the plugs then andthey looked good still. Air and fuel filter was changed within the last10,000 miles and I looked at the air filter today and it looks good.So in the event that I don't get any codes from the computer can anyoneoffer some suggestions? Could one of the oxygen sensors be bad and not givea code? I guess that I could have a leaky fuel injector too?ThanksBrian

Dec 05, 2004 21 Replies

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HDS 20 years ago

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Oxygenated gas also kills fuel mileage.. read your pump carefully.. Winter is usually the time they like to OJ the gas... drives me crazy.

HDS

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TheSnoMan 20 years ago

When you add alchol to fuel you are oxygenating it too as well as lowering BTU content

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