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  1. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    I calculated my gas mileage on my 04 envoy and its 12.8 miles per gallon. Is that normal and is there any way to improve? I have 155,000 miles and the 4.2 I6 engine.
    bad gas mileage gas milage
  2. Air Induction
    Hey guys, Just want to first say wow. This site is awesome. I just got my Tblazer a month ago (05 LS with 38k on the clock). Planning on keeping it mostly stock for resale reasons. I am on my 3rd full tank of gas right now and am a little perplexed. My first full tank was on cheapo...
    air filter gas milage spark plug throttle body
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