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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 06-05-2006, 02:26 PM   #91
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I have had my new 2005 GXP for less than 2 weeks now - but I had a 1,600 mile drive home with it - Ha! I live just southwest of Houston, TX and bought my car in northern Virginia and drove down through Charlotte, NC. I reset the fuel avg every time I filled up and had a high of 21.4 mpg and a low of 19.4 mpg. Not too bad as I was usually around 75mph and in some hilly conditions at times. Here at home I have seen a much lower avg - but I am sure it is due to mostly in-town driving, spirited driving, and a short warmup period each time I take it out.

I plan on adding a K&N Filter and some Bosch Platinum +4 Plugs (have them in our other 3 vehicles and have been very pleased with them despite negative comments about them on some other boards) to boost HP a bit and maybe pick up a slight amount in fuel economy as well.

Looking for more mods - but they sure seem to be few and far between. Very happy to find this forum though. Thanks!
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Old 08-14-2006, 03:41 PM   #92
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We have a 2005 Bonne GXP. Took it to Indy last weekend for the All State 400 and we got 21.5 to 22.5 on the Interstate traveling anywhere from 70-75 mph. Had some two lane 60 mph driving on the way home and we were getting 24 at 60 mph. Car has 13,000 miles, 87 octane with normal driving.
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Old 08-14-2006, 03:45 PM   #93
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Please start a new topic. Do not bring up old ones.

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Old 08-14-2006, 03:51 PM   #94
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Bonneville94V688


Do you have a problem with people posting a reply to a thread? You can start your own new topic, I am posting on this topic.
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Old 08-14-2006, 04:11 PM   #95
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Quote:
Originally Posted by RemingtonDave
Plus they do at least 129 mph in third (at least mine does).
Who needs fourth?

Make that 130 mph in third.
And getting 22 mpg now.


Posted purely to irritate the self-appointed topic police.
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Old 08-14-2006, 06:12 PM   #96
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Quote:
Originally Posted by Buzz38
It may be a little anal but I keep a book on every car I own. I never trust the computer to tell me what I get for economy. I do the math on every tank I run and log it. I will say that of the vehicles I have had with the running mileage computer the GXP is the closest to correct.
My computer is pretty accurate as far as the MPG and Gallons used. I live in So. Cal and get really crappy MPG also, I get about 14.5 to 15 and I have an 01 SSEi. Have really never gotten any better than 19 on the Hiway and that was a while ago. I really believe it is the California Gas as well as our terrain here. I have only 59k on mine and have made some minor mod'* as well as replacing the o2 sensor and given it 3k oil changes like clockwork. Tires are always inflated properly. I really love my 01 and would not trade it for the world, I'll keep it until the day I die. It'* just one of those types of vehicles. The MPG I really can care less about, I'd like better but I really don't Give A D**n! I think the GXP'* are bitchen car'* and turns alot of heads.
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Old 08-14-2006, 08:18 PM   #97
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My 05 GXP didnt get more than 17mpg most of the time. I think the N* has to work harder since theres not much power down low and thats what hurt peoples gas miles.
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Old 08-15-2006, 09:33 AM   #98
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Quote:
Originally Posted by Torker 2
Bonneville94V688


Do you have a problem with people posting a reply to a thread? You can start your own new topic, I am posting on this topic.
Torker--Bonneville94V688 was trying to be helpful. We do not like threads that are more than 30 days old to be "dug up"...meaning, a new post added to the thread.
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