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  1. Engines/Performance/Tech Questions
    My question is, has anyone else noticed a substantial drop in gas mileage as outside air temps drop below about 50 or 60F? As an official old fart, I remember vehicles with a heated air intakes. Supposed to help evaporate the fuel being introduced into the air stream of the carburetor. (yes, I'm...
    air intake fuel mileage
  2. I4/I5 Engine & Drivetrain
    i have a 2007 Colorado, 2.9L, Z71, 4x4, 5 speed with 38650 miles. I get 15 in city and 19 on the highway. I had no idea my gas mileage would be like that. the factory window sticker says 18 and 23. I've changed the spark plugs, cleaned throttle body and MAP sensor. nothing improved. I have had a...
    2.9l fuel mileage manual transmission
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