- #32 of 71
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Re: Mileage [rmozol]
by bubbaman999
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Apr 21, 2006 (10:12 am)
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Replying to: rmozol (Apr 20, 2006 10:26 pm)
Robert,
It was 102 and 100 last monday and tuesday in Fort Worth and the temp gauge was mostly at the middle. Mind you I didn't sit in a lot of traffic, but it didn't seem to creep. I have about 800 miles on mine and have seen my last two tankfuls city/hwy mix around 22.5 to 23.2 MPG (my calc and the computer). I think I have seen a slight jump after 500 miles or so. It is hot early here and will last a long time (Oct) so will let you know if I see temperature creep.
Loving my GXP in Texas,
Gary
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- #33 of 71
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Re: Mileage [bubbaman999]
by mcp6530
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Apr 21, 2006 (3:23 pm)
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Replying to: bubbaman999 (Apr 21, 2006 10:12 am)
I don't know how you guys do it! Highway driving, several trips of 350 miles and i average 21 or 22 mpg...granted i'm doing 80 to 90 the entire way. Then city driving, i'm lucky if i clear 18...I sure miss my supercharged bonne ssei! no, not really.
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- #34 of 71
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Re: Mileage [mcp6530]
by bubbaman999
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Apr 21, 2006 (4:16 pm)
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Replying to: mcp6530 (Apr 21, 2006 3:23 pm)
When I drive all city 17-18 is the norm. Even a little highway time helps, but around town, traffic isn't bad but I only go 65 or so, 80-90 will really hurt mileage. A lot of times in the morning and evening commute I am either not awake enough or still thinking about the day in the evening, so I use the cruise at 65. It's the errands on weekends that I really get to have fun with the GXP and V-8 power and my MPG suffers, I have had a 16.5 and 17.2 MPG tankful. That said just slepping into work is still great with the comfortable seats and XM radio. I love the GXP even if I don't use all the V-8 power all the time. Do you run premium gas? I have been comparing and maybe it is my imagination, but I think I get a couple MPG better with premium, only time will tell.
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- #35 of 71
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Re: Mileage [bubbaman999]
by splatsterhound
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Apr 22, 2006 (8:06 pm)
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Replying to: bubbaman999 (Apr 21, 2006 4:16 pm)
I've had a chance to do some longer driving in the GXP. AWESOME CAR! Today I cruised just a little below 60 through metro highway traffic. The traffic was weekend, and I was in in no hurry, but I did have to ease up occasionally. The mpg for the 25 mile trip was 28 accordign to the computer. THAT ROCKS! I can get ABOVE 30 if I really baby it. Normal driving (LOTS of stop and go city and, of course, LOTS of letting friends test drive the car) nets me about 19 mpg. And my friends ALL want to drive this car. That really drives the mpg down.  I'm driving it like a granny. My chums love the acceleration. Best car I've ever owned, by far. Quality has been terrific. Fit and finish are flawless. Brakes are stunning. Hit them and the car just....stops. I can't get the car much though because my wife drives it all the time... 
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- #36 of 71
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Re: Mileage [splatsterhound]
by bob97
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Apr 24, 2006 (8:48 am)
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Replying to: splatsterhound (Apr 22, 2006 8:06 pm)
Everyone seems to be doing a lot better then I am with mileage. My 2006 GXP with a little over 5k miles is only giving me 14 to 15 MPG driving around town – premium gas only and without a heavy foot! I am almost tempted to complain to the dealer about my low MPG, but I cannot image what would cause one car to be off so much (it runs great in every other respect). I am constantly driving up and down low gradients, but I’d expect the downs to average out the ups.
Is anyone else falling short of the MPG numbers being posted here?
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- #37 of 71
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Re: Mileage [mcp6530]
by blckthree
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Apr 24, 2006 (9:34 am)
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Replying to: mcp6530 (Apr 21, 2006 3:23 pm)
Your mileage is the same as mine. I don't run 90, but just over 80 and I will get 20-22mpg. City driving, without any highway driving, lots of traffic lights and stop and go traffic, I get more like 13-14.
On a daily commute to work, I keep it around 70mph, and get about 24mpg. The mileage is acceptable to me, but I wish they wouldn't have put that sticker on that said you could get 28. I'll never see that.
All this is with 87 octane fuel.
Mike
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- #38 of 71
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Re: Mileage [bob97]
by chats1
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Apr 24, 2006 (10:00 am)
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Replying to: bob97 (Apr 24, 2006 8:48 am)
I have a 2006 GXP. When I first got the car I was getting about 13-14 and a little upset because of what GM said we would get. Now, I have 10,000 miles on my car and the highest I have gotten is 26.5; the lowest 19 around town. I drive mostly on highways. I use only Amoco Ultimate as I did with my three previous GTP's. I am satisfied with my mileage. As far as the gas prices go, there is absolutely nothing you can do about it, so I don't even complain. I'm just worried about gas lines and not being able to get gas. I knew when I purchased this car that I would use more gas and my mileage would be less than on my GTP's but I didn't care. If I was to worry about gas, I would have bought a Toyota which didn't interest me at all. I am very pleased with this car and its performance. My brother was complaining about the gas, I told him to use a bike!! I think that the more mileage you put on the car, the better the gas mileage. That's how it has worked with my car.
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- #39 of 71
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Re: Mileage [blckthree]
by overcammed
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Apr 27, 2006 (10:50 am)
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Replying to: blckthree (Apr 24, 2006 9:34 am)
Me too! I'm getting a whopping 14.3 MPG city, recently up from 12.1. My gxp has 2500 miles on it and fuel economy in town has been 12.1-12.4 up to the last tankful of 87. I guess it finally broke in. also it used a quart of oil by the time it had 1900 on it. My wife and I really adore the power and handling though, and I'm pleasantly surprised by the number of compliments we have recieved on it's styling and color(dark cherry).We're panning a trip to springfeild soon, can't wait to see some hiway numbers.
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- #40 of 71
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Fuel guzzler, crack grabber
by erichthecatt
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May 21, 2006 (8:49 pm)
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Took my 05 GXP on a road trip to vegas this weekend. 600 mile round trip. 11,500 miles on the car. Going i got 23.5 mpg. averaged about 70. coming home i got 23.9 mpg. averaged 70-80. Guess the mileage isnt going to improve. Miss my 2000 sls..same engine...would get 28! Those low profile tires suck. they ride hard and follow every crack in the road. Does anyone know if i can put a tire on the car with more rubber without the tire rubbing since the clearances are tight??
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- #41 of 71
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Re: Fuel guzzler, crack grabber [erichthecatt]
by rmozol
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May 21, 2006 (9:45 pm)
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Replying to: erichthecatt (May 21, 2006 8:49 pm)
I thought that this engine was new in 2005? I know they made some iron-block 5.3 Vortec, but the all-aluminum was new I thought. 24 MPG isn't that bad either in that altitude. If you mean a wider tire, I doubt there's much more room. If you mean taller, with more sidewall to absorb the cracks, we might be out of luck too. You'd have to go to a thinner tire, with a higher aspect ratio; like a 235/60 x 18? Then the traction would stink since it would be narrower!
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