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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 11-27-2004, 11:38 PM   #51
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REALLY? I know Califonia has some unique smog/pollution regualtions but never thought they would "dumb down" the gas... I guess that could attribute to your lower gas mileage. I was going to suggest having them reprogram your PCM, but I guess that wouldn't help.

I guess us rednex in Florida are pretty lucky even with those da-burn hurricanes!
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Old 11-28-2004, 12:09 AM   #52
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Quote:
Originally Posted by chuckwi11
REALLY? I know Califonia has some unique smog/pollution regualtions but never thought they would "dumb down" the gas... I guess that could attribute to your lower gas mileage. I was going to suggest having them reprogram your PCM, but I guess that wouldn't help.

I guess us rednex in Florida are pretty lucky even with those da-burn hurricanes!
Yeah, first they forced MTBE on us to clean the air but 10 years later they realized that our groundwater was being polluted buy it. I can't count how many wells have been closed because of it. Then they decided to let the refineries use up what they had left while the politicians decided what to replace it with. Isn't it funny how the government of the most assinine "environment friendly" state can get away with polluting? Let some company do the same thing and watch all hell break loose. Some of these as_holes oughtta be shot for this crap. Our gas costs us about 10% in economy. That'* another irony... We burn 10% more gas so we can make the air cleaner. The real story is revenue. More fuel burned = more fuel taxes for the state.
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Old 11-28-2004, 08:32 AM   #53
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The owners manual specifically addresses MTBE and cautions against using gasolines that are formualted with it in the Northstar. I'm not sure if the emission control stuff they put on for California resolves this or not... not sure exactly what MTBE does but I checked to see what brands used it in my area and fortunately none of the major brands use it in Florida.

If you can't acheive any better MPG than 15 tho, I would have the dealer take a look at it to see if maybe reprogamming the PCM would help. I will admit that my mileage suffers greatly in stop and go traffic, the N* beast just doesn't like to be "leashed" I suppose... then again it suffers above 75mph. Seems like it has a real tight efficiency band, not as generous as my 5.3L Silverado.
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Old 11-29-2004, 07:44 AM   #54
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Default 3.71 Final Drive ratio

Let'* not forget the aggressive "rear end" for our front drivers also. 3.71 gears on a DOHC V8 that likes to rev is going to suck some fuel when you punch it. Driving on city streets is very painful here in Berlin. The Germans do lack a sort of common sense when it comes to driving. They have some of the SLOWEST speed limits in the world in their cities, the fastest on the autobahn, almost no right turn on reds, and very few turning lanes when you go right or left. That being said, I am always gunning the car to get around people making turns and maintaining the 32 mph (50 kph) speed limit where the engine can't even get out of 3rd gear! My mileage is definitely of the city type 90% of the time and I am just barely at 16 mpg. I also get a little excited on the autobahn too where I have had it to 140 mph. So, I've come to accept this until I get back to the states. But I do have alot of fun! A group of Italians were walking around the car last night when I was at the Hard Rock Café here. When I started it and they heard the rumble, they loved it!
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Old 01-07-2005, 11:02 PM   #55
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Just ripped through 7000 miles and my mileage is running 18.7 - 19.2 MPG. This is both off the DIC and calculated. As a point of reference I put about 80miles of interstate (I-4) driving and 20 miles of city drving a day. All in all, I think it'* pretty good for a V8.
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Old 01-09-2005, 12:07 AM   #56
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Same here chuckwi11, except I think I'm pushing 8K miles now. I do mostly highway (95%) and get about 19.9 MPG - and thats up and down the various mountain roads in Southern CA. I'm pretty happy. I have to drive 'easy' to get those numbers though, but I do get to do some "power passing" on occasion

Just looked at your personal web page - nice photos. WHERE DID YOU GET THE NORTHSTAR BADGES?!? Mine does not have those.

Liquid Silver is sweet. Glad I picked it as well. I have seen the White Gold Tricoat and think it'* ugly. Otherwise I've never seen any other GXPs!
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Old 01-09-2005, 08:31 AM   #57
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They are 2005 Cadillac badges... I got them on eBay. It'* a little thing but it really dresses up the car. If you can't find the auctions let me know and I'll see if I can find the seller so you can search on his name... something like "Cadillac Jim" maybe??? They cost me about $50 for three with shipping.
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Old 01-09-2005, 07:47 PM   #58
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Quote:
Originally Posted by chuckwi11
They are 2005 Cadillac badges... I got them on eBay. It'* a little thing but it really dresses up the car. If you can't find the auctions let me know and I'll see if I can find the seller so you can search on his name... something like "Cadillac Jim" maybe??? They cost me about $50 for three with shipping.
would they be available from a caddy dealer? Go in and tell them you need them for your OTHER car
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Old 01-12-2005, 05:09 PM   #59
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Default Mileage improving!

So I decided to take a 500 mile drive through Germany last weekend but maintain "reasonable" speed limits through the whole process just to get an accurate reading for my mileage. I stayed at the posted speed limits when there were some and when there weren't any I kept it about 82 mph. I got an incredible 22mpg for the entire trip. I was very happy with that. In the city or on short trips is where this car gets thirsty. Also when you want to have a little fun of course. Just went over 5300 miles on the odometer.
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Old 07-16-2005, 07:46 PM   #60
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We have had our 2005 gxp for 6 months and the car is averaging 17-18 mpg.
highway and city
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