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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 05-14-2006, 04:21 PM   #81
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Well it isnt just my engine that chugs gas,... I'm glad to see Hemieater. A 4 hour aggressive trip with My car club came into Carlilse custom show at 10.8 but a guiet ride home has it back to 14.2. It was car'* first highway trip and now has near 2600 miles.I havent seen a 15MPG since I bought it. The $3.32 per gal. has tempered my foot. Crusing with car and nitrous has gotten to be a costly habit
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Old 05-14-2006, 05:15 PM   #82
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Hemieater...our GXP'*.....lol I think its the otherway around.
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Old 05-14-2006, 11:33 PM   #83
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10,000 miles on mine and I'm getting 21 mpg. I don't drive particularly hard but I put my foot into it a couple times a day.
I was only getting around 17 in the winter, probably from longer warmups.
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Old 05-19-2006, 07:14 PM   #84
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Well filled up Tuesday 5-16 (Prem for Reg Price $2.65 on super Tuesdays) and computer is now showing 14.8 AVG for 1/4 Tank. Wife tells me its my foot? Dealer tells me put some miles on it and stop washing it and just parking it in the garage.
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Old 05-22-2006, 07:44 PM   #85
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After a weekend on the road, and no nitrous runs.....I am back to 13.8. Odometer now at 2800. Motor seems to be loosing up alot and tranny shifting as I want it using the gas pedal.
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Old 05-22-2006, 08:49 PM   #86
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Everything on mine felt tight until 7500 miles or so. She pulled noticably stronger after that point too.
No 1000 mile break-ins with these cars.
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Old 05-23-2006, 01:31 PM   #87
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Quote:
Originally Posted by GXP Venom
After a weekend on the road, and no nitrous runs.....I am back to 13.8. Odometer now at 2800. Motor seems to be loosing up alot and tranny shifting as I want it using the gas pedal.

13.8 your you drive a bit fast dont you...lol I think I am at 16.8 but I drive the car once a month these days...but when I do I drive pretty quickly.
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Old 05-23-2006, 07:50 PM   #88
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That may seem low but the truth is almost all my miles are two lane country road and city miles. Car seldoms see'* the highway and I am a FIRM believer in not using 4'th gear in an automatic unless your on the highway. The constant shifting between 3 and 4 really what wears a tranny. My cabs lasted a lot longer once I started that practice. Went up to Ithaca today (highway) and she read 15.2 when I got home.... A new best for my car.
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Old 05-24-2006, 01:30 PM   #89
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Quote:
Originally Posted by GXP Venom
That may seem low but the truth is almost all my miles are two lane country road and city miles. Car seldoms see'* the highway and I am a FIRM believer in not using 4'th gear in an automatic unless your on the highway. The constant shifting between 3 and 4 really what wears a tranny. My cabs lasted a lot longer once I started that practice. Went up to Ithaca today (highway) and she read 15.2 when I got home.... A new best for my car.

Yeah and out cars feel much faster in 3rd than in 4th
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Old 05-24-2006, 02:42 PM   #90
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Plus they do at least 129 mph in third (at least mine does).
Who needs fourth?
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