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Sedans Pontiac Grand Prix Pontiac Grand Prix: Real World MPG
71 messages, Last post on Jul 03, 2008 at 6:54 PM
You are in the Pontiac Grand Prix Forum. Your Hosts are pat & karens
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Repost from last fall: GXP gas mileage November Thanksgiving 2005 trip The good news is that I (finally) exceeded 20 MPG for a full tank. The bad news is that I am afraid it is pretty clear that I will never achieve the highway EPA rating. (Unless the gas mileage improves as I add more miles – though at 7,000+ now, I doubt that.) I drove from Atlanta to Carrabelle, FL and back. I filled the tank once I cleared the metro area. I filled the tank again at 232 miles (last gas in Georgia) and filled again in Tifton, before re-joining I75 North for the slog home on Sunday PM. (I did not want to count that mileage, as the traffic became bad & worse – as feared \ expected.) I averaged these 2 fills, since they were not the pumps I typically use – and there are variances. The 2 fills = 470 miles. Total fuel used = 19.35 gal. Average MPG = 24.3. (Excel, not DIC.) I did not exceed 80 MPH on the Interstate section southbound. Once off the Interstate, the speed limits and (um) aggressive enforcement mean that I find 65 the highest ‘reasonable & prudent’ speed. A little experimenting with various steady speeds on relatively level roads strongly suggests that DoD is much more likely to engage at 60 – 70 than at any higher speeds. With resulting steep downslope to MPG as speeds rise above 70. = = = I have seen no significant difference in my MPG since then, and I am now nearly at 14,000 miles. I’d like better fuel mileage – but my ( um ) un-disciplined right foot and over 300 HP \ TQ suggests that I am not willing to sacrifice an occasional acceleration “burst” for another 1 or 2 overall MPG. Given how much fun I have when I can use my GXP’s performance, I am pretty happy with the fuel mileage. I will be taking exactly the same trip described above this weekend, leaving Saturday AM (early) and returning Tuesday. I will post an update. - Ray Looking forward to 6+ hours of “Quality Time” with my XM each way . . |
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Left the Atlanta area at 6 AM Saturday. Stopped to fill the tank just South of the City. Kept the speed to 70 – 80 to my exit in Tifton, GA. My speeds off the Interstate were 45 – 65. Through a number of small towns, (and later) through the outskirts of Tallahassee, south to 98, then west. Filled at the (next to) last gas in Georgia. A/C was on about half the time: 225 miles 24.5 MPG (DIC – Excel: 26.5). Destination was Carrabelle, FL – and my hosts used their (4 wheeled & water) vehicles, while mine sat idle . . On the return trip, I filled the tank again in Tifton. 23.8 MPG – A/C on this whole leg. 248 miles. (Excel: 24.5) Traveling North on I75 on Tuesday AM, was able to maintain a steady 78 – 80 with cruise control on for just over 100 miles – to the rest area on the Macon Bypass. Settled in at 23.5 MPG for that segment, with the A/C on. I was alone in the car & only had weekend luggage. Just a few mileage data points . . Over 14,000 miles on the car & just over 400 hours on the motor. A relatively painless journey! - Ray Happy GXP driver . .
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Replying to: rayainsw (May 31, 2006 3:57 am)
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Replying to: eagle75 (Jun 02, 2006 4:07 pm) Did you use cruise? Mostly level terrain, I assume. Also what fuel type did you use? I think I may see a difference with premium versus mid-grade, but don't have enough samples to prove it. Cheers, Gary
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Replying to: bubbaman999 (Jun 04, 2006 5:11 am) On cruise most of the way--pretty flat country around these parts--some rolling hills--this was an ocean bottom a bazillion years ago. I've been using regular unleaded from day one. Bill |
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OK CAN I HEAR SOME GP GXP OWNERS' BEST GAS MILEAGE REPORTS,I HAVE 3400 MILES ON MY 06 AND THE BEST I HAVE GOTTEN THUS FAR IS 20.2 MPG WITH 80/20 HWY/CITY.I KEEP HEARIN PEOPLE SAY ITS GOTTA GET BROKE IN,WELL IF 3400 MILES ISNT BROKEN IN THEN I FEEL LIKE TRADIN IT IN,THAT 28 MPG ON THE HIGHWAY IS SO FAR A BAD EST. BY THE EPA,I THINK.... GXPJOEYP FROM WI
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Replying to: gxpjoeyp (Jul 24, 2006 9:32 pm) I've taken a few 2-3 hour trips to see family. My overall average then has been 24-26mpg. Mostly highway of course, but sitting at even a few lights and going around town once I get to my destination really hurts. Honestly, I budget my gas money on 15mpg, perhaps you can use 18 or 19 and be safe. |
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Replying to: gxpjoeyp (Jul 24, 2006 9:32 pm) Sorry to hear about your mileage. My recent long trip got anywhere from 25-27.8 MPG depending on hills/flat terrain on mid-grade gas. Mostly doing cruise 73-75 with ac. Also think I got 28.5, but not sure on an all hwy down hill segment. Am seeing 21-22 hwy/city mix to work. But if I play with the throttle then it is easy to get 17-18. I find that cruise works much better than my best at having a light foot. Have seen an improvement sometime between 2500-5000 miles, currently have 5500. Cheers, Gary
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Replying to: bubbaman999 (Jul 26, 2006 4:52 pm) GXP JOEYP
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Replying to: gxpjoeyp (Jul 26, 2006 8:19 pm) Shamefully a Cowboys fan, Gary
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