Gas Consumption Problem

GMC C1500
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EYE NO NUTTING
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I have a 1998 GMC 1500 4x4 with 119000 miles. Truck runs fine, starts the first time but gas is being consumed quicker over the last year, or so.

I used to be able to drive 320-360 miles on a tank. I currently only get 220-260 miles to the tank. What is the best approach to see the greatest increase in mpg? Filters, plugs, wires, timing, O2 sensor, etc.?

I have recently lost my trusted mechanic and don't want to get soaked by someone not as reputable. A lot of these things I can do mechanically, however, I am not so proficient in engine performance.

Any help you can offer will be greatly appreciated.

Thank you.
Apr 5, 2006 at 12:41 PM
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NOS155
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i would give it a tune up(plugs, wires, etc) and check fuel pressure and also a fuel injector cleaning will help out. if its got a rough idle then its a good chance that its dirty or faulty fuel injectors. Also is the check engine light on? or does it come on every so offten then goes out? if so then you have a bad sensor and posibly the O2 sensor. hope this helps out!
May 4, 2006 at 2:40 AM
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DOBBER
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If the thermostat is stuck open, the engine runs cold and causes an increase in fuel consumption. How does your guage read?
Sep 10, 2008 at 6:42 PM
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