GXP Gas Mileage - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-24-2007, 09:43 AM   #11
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Mine has definitely gone up as well. I purchased the car with 7500 miles and I was getting 15 - 16 mpg during my rush hour commuting. Now at 15k miles, I'm getting 17 - 18 for the same commute. I managed to squeeze out 24 mpg on a highway trip, although I had to keep the max speed to 75mph for the most part to get that.

I have attributed some of this gain to the fact that I bought the car in July, so I was running the A/C all the time when I first got it. I guess I'll know for sure next summer.

Keep in mind that the new gas with 10% ethanol will yield a little less mpg than the old stuff. I believe it'* something like a 5% drop.
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Old 01-24-2007, 02:22 PM   #12
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Well, I left work a little late last night and figured, since traffic was light, I would test the mpg. Result was that cruising at 75mph I was getting around 29mpg. Keep in mind there are no hills in Houston. Pretty much a flat grade the whole trip to home and there is no need to be using the AC this time of year.

I think for the size and weight of this car those numbers are about as good as it'* going to get.
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