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2000 Chevy S-10 poor gas mileage

Tiny
MRVICTROLA
  • MEMBER
  • 2000 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 136,000 MILES
I have a flex fuel 4 cylinder and I bought it used. I got this for better gas mileage, but have noticed that it does worse than my other s-10 with a 4.3 v6. I know someone with another flex fuel and he is getting great mileage (30 or better on the highway) mine only gets 18-20. I have done new plugs, wires and fuel filter. What could be the problem? My other truck, a v6 I get 24 mpg.
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Saturday, March 15th, 2008 AT 8:09 AM

1 Reply

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
You may have a bad oxegen sensor or it is ineed of a full vehicle tune up.

Filter, plug, wires, oil change, air filter change, tire pressure, tranny fluid check, idle adjust.
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Saturday, March 15th, 2008 AT 10:03 PM

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