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Pontiac Grand Prix: Real World MPG

71 messages,  Last post on Jul 03, 2008 at 6:54 PM

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What is this discussion about? Pontiac Grand Prix, Fuel Efficiency (MPG), Sedan


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#2 of 71
MPG Break Even vs. Cost of Gas by bubbaman999
Jun 10, 2006 (8:02 am)
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All, came up with a spreadsheet doing a little figuring on whether it is worth additional money for better gas, from strictly a MPG cost perspective. Not from a feel/power/engine health perspective. Don't have enough mileage data on my own 06 GXP, but will monitor. Thoughts? Here is the data, assuming $2.75/gallon regular unleaded. Here is the data you can plot for yourself.
 
First Column is MPG with regular Gas
2nd Column is MPG Need if upgraded gas is 10 cents more a gallon to break even
3rd Column is MPG Needed if gas is 20 cents more break even
4th Column is 30 cents break even
 
MPG $0.10 $0.20 $0.30
19 19.69090909 20.38181818 21.07272727
19.2 19.89818182 20.59636364 21.29454545
19.4 20.10545455 20.81090909 21.51636364
19.6 20.31272727 21.02545455 21.73818182
19.8 20.52 21.24 21.96
20 20.72727273 21.45454545 22.18181818
20.2 20.93454545 21.66909091 22.40363636
20.4 21.14181818 21.88363636 22.62545455
20.6 21.34909091 22.09818182 22.84727273
20.8 21.55636364 22.31272727 23.06909091
21 21.76363636 22.52727273 23.29090909
21.2 21.97090909 22.74181818 23.51272727
21.4 22.17818182 22.95636364 23.73454545
21.6 22.38545455 23.17090909 23.95636364
21.8 22.59272727 23.38545455 24.17818182
22 22.8 23.6 24.4
22.2 23.00727273 23.81454545 24.62181818
22.4 23.21454545 24.02909091 24.84363636
22.6 23.42181818 24.24363636 25.06545455
22.8 23.62909091 24.45818182 25.28727273
23 23.83636364 24.67272727 25.50909091
23.2 24.04363636 24.88727273 25.73090909
23.4 24.25090909 25.10181818 25.95272727
23.6 24.45818182 25.31636364 26.17454545
23.8 24.66545455 25.53090909 26.39636364
24 24.87272727 25.74545455 26.61818182
24.2 25.08 25.96 26.84
24.4 25.28727273 26.17454545 27.06181818
24.6 25.49454545 26.38909091 27.28363636
24.8 25.70181818 26.60363636 27.50545455
25 25.90909091 26.81818182 27.72727273
25.2 26.11636364 27.03272727 27.94909091
25.4 26.32363636 27.24727273 28.17090909
25.6 26.53090909 27.46181818 28.39272727
25.8 26.73818182 27.67636364 28.61454545
26 26.94545455 27.89090909 28.83636364
26.2 27.15272727 28.10545455 29.05818182
26.4 27.36 28.32 29.28
26.6 27.56727273 28.53454545 29.50181818
26.8 27.77454545 28.74909091 29.72363636
27 27.98181818 28.96363636 29.94545455
 
#3 of 71
Current Highway MPG - GXP by bubbaman999
Jul 02, 2006 (5:12 am)
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All,
Just finished the first segment of a road trip. Here are the MPG results. Some city/highway, slight upgrade, Computer 24.6 Calculated 25.
 
Second day: Computer: 26.9 Calculated 27.4
Another Tank, lot of down grade: Computer 28 Calculated 29
 
Don't know if I believe the calculated, tried to fully fill the tank, but wow.
 
Full highway driving really helps the MPG on the 28MPG case used cruise 74mph but some segments of highway at 68 due to 65 speed limit.
 
All on mid-grade gas. More later. Very happy with these numbers, plus great ride, comfy seats.
 
Cheers,
Gary
#4 of 71
Combined MPG by avangilder
Jul 07, 2006 (12:17 pm)
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I hope someone might be able to help me out. I've got a 2000 Grand Prix GT, and I can't get anything higher than 20 MPG (combined) on regular gas. The car cruises (75-85 mph) between 2500 and 3000 RPM. Any ideas?
#5 of 71
NEW 2007 GP GXP by gxpjoeyp
Aug 17, 2006 (3:09 pm)
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HI ALL I JUST SEEN THE WINDOW STICKER FOR THE 07 GP GXP, BASE PRICE IS UP MORE THAN $1,000.00 XM IS DOWN FROM THE 06 PRICE OF 385.00 TO 199.00,AND THE THING THAT CAUGHT MY EYE THE MOST IS THE EPA MPG 2006 WAS EST AT 17/CITY 28/HWY...THE 07 IS 17/25 3 MPG LESS THAN THE 06,HUGE DIFFRENCE IN MY EYES A FAR AS EST GO.I HAVE 4200 MILES ON MY 06 AND STILL HAVENT CRACKED 21 MPG WITH 85% HWY DRIVIN...JUST MY 2 CENTS
 
GXPJOEYP
#6 of 71
Re: NEW 2007 GP GXP [gxpjoeyp] by bubbaman999
Aug 18, 2006 (2:52 am)
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Replying to: gxpjoeyp (Aug 17, 2006 3:09 pm)

I thought that EPA estimates were going to get tougher this next year for all cars, expect them to go down for all. Is it 07 or 08 they were going to change.
 
Question, I got 26/27 on my all highway trips using mid-grade. What I have seen in the city/hwy mix is that different grades of gas matters. I have averaged 19-20.5 for regular. 20.9-21.5 for mid-grade and 21.9-23 for premium mix city/hwy. I use cruise on the freeway since the cutoff to 4 cyl is done much better buy the computer over my foot.
 
Hope this helps,
Cheers,
Gary
#7 of 71
Re: NEW 2007 GP GXP [bubbaman999] by gxpjoeyp
Aug 18, 2006 (2:38 pm)
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Replying to: bubbaman999 (Aug 18, 2006 2:52 am)

Maybe the gas in wisconsin is lousy I dont know but I do know that I have always used premium/93 octane since the car was new,do the cruise thing on the xpway,dont hammer the hell out of it, who knows,but here in milwaukee we use that re formulated gas more expensive cause it burns cleaner so they say 75 miles north of me they use the "old" gas....GO STEELERS!!!!!
 
GXPJOEYP
#8 of 71
Re: NEW 2007 GP GXP [gxpjoeyp] by bubbaman999
Aug 18, 2006 (6:03 pm)
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Replying to: gxpjoeyp (Aug 18, 2006 2:38 pm)

Interesting, noticed when the summer formulation, aka, more ethanol came out mileage dropped a little. But this weeks tank is 22.0 on premium. What is your total miles, mine is at 5600.
 
Deep in the heart of Texas,
 
Go Cowboys,
 
Cheers,
Gary
#9 of 71
Re: NEW 2007 GP GXP [bubbaman999] by gxpjoeyp
Aug 19, 2006 (12:03 am)
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Replying to: bubbaman999 (Aug 18, 2006 6:03 pm)

WELL THE COWBOYS #$%^^&& HA HA HA 1ST AND FOREMOST, AND I GOT 4300 MILES ON MY 06
#10 of 71
Re: NEW 2007 GP GXP [gxpjoeyp] by ocmike3
Aug 19, 2006 (12:38 pm)
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Replying to: gxpjoeyp (Aug 17, 2006 3:09 pm)

I've only got about 4400 miles on my 2005 GXP. My last road trip was cruising 65mph +/- a couple mph and the 5.3L DOD returned 27.6mpg (232 miles 8.4 gallons premium) running the A/C for a good portion of the trip.
I know during the winter months we have to run 10% ethanol and my mileage drops by 10 -15%.
I do know if I let my foot control the throttle the mileage isn't nearly as good.
#11 of 71
Re: NEW 2007 GP GXP [bubbaman999] by blckthree
Aug 21, 2006 (10:04 am)
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Replying to: bubbaman999 (Aug 18, 2006 2:52 am)

I sure don't know how you got 26/27 on the highway, wish I could. Only time I came close to that was one day on some flat highway with a tail wind, got 25, never seen it since.
 
My average highway speed is about 80mph, give or take a bit. Average mpg is about 21-22. Not bad for 80mph, but not what I had hoped for. I won't complain, it is still a nice ride and cheaper to feed than the old Yukon was.
 
Just over 13000 miles now, no troubles except for an OnStar module going out. Didn't bother me, except that it had some message every time you started the car. Got tired of the car talking to me.
 
Mike

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