Question about 2000 Pontiac Grand Prix

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Just moved from New Mexico to Florida and the gas mileage in my 2000 Grand Prix and dropped to about 10 to 12 mpg. Is it the change in elevation?

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  • cindy_irwin Jun 26, 2009

    Thats what I had thought but everyone told me the computer should adjust. What did you do to solve the problem?

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  • Pontiac Master
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I just dealt with a similar issue.I moved from Florida to Missouri and yes there is a difference from elevation and the humidity in the air and gas mileage.

Posted on Jun 26, 2009

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1 Answer

Drop in gas milage with drop in altitude


I would guess your car was built to the Emission Standards
for your state,altitude etc

Still a big drop in mpg

If you ever moved, you may need your computer software
reflashed for lower elevation

I would guess the MAF Sensor was out of it's range

Check to see if any codes were stored
Need professional scanner

Look at freeze frame data unless you have been back for weeks

Mar 20, 2014 | 2011 Hyundai Elantra Touring

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Low gas mileage city and hiway @ 4-5 MPG below MSRP sticker data of 15 and 21MPG on a NEW 2013 Silverado. 2000 miles on odometer and mileage not improving.


is this calculated mileage or what the estimated mileage is showing on the dash. Have you checked to see what you get on just the freeway?

What are your driving habits like?

How is your tire pressure?

Do you make a lot of short trips?

Apr 11, 2013 | Cars & Trucks

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Lower gas millage related to transmission not dropping down (lowewr revs)?


I would get ride of it

No reason to even discuss all the possible issues

The trans sounds as though it is slipping

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2 Answers

Gas mileage dropped down to about 20 mpg from 33


i find it hard tto believe you ever got 33 mpg,
but you can always install some new plugs ans air filter,

Dec 26, 2009 | 2005 Chevrolet Malibu

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Could my MAP sensor be faulty? My gas mileage has gone down to 10 mpg since I moved to Florida?


replace air filter .change spark plugs and wires.transmission slipping .check tranny fluid.if you got manual transmission.clutch could be slipping.low tire pressure.brake could be dragging.high speed driving and a lot short runs.stopping and going burn a lot of gas.scan it to check oxygen sensor.it will cause fuel consumption.

Jun 26, 2009 | 2000 Pontiac Grand Prix

1 Answer

Gas mileage has tanked on 2000 Grand Cherokee Laredo w/V8


I'm not sure I have a solution to this but the change in altitude should cause a change in mpg. However, the car was not put in a box and shipped there, it was driven...and should have adjusted gradually to the change. (computer should re-calibrate). The only item that may be affected would be the map sensor. Possibly, since it has always worked at one altitude, it may have worn in that area and is hanging up and unable to adjust.
If the trip was made quickly, the computer may not have re-calibrated itself yet (depending upon how long it's been in Alaska) You may want to try disconnecting the battery and then re-connecting it, or it may need to be manually re-calibrated using a scan tool. The computer likely is working properly though otherwise with that kind of mpg you should be blowing a bit of black smoke out the back. Only other thing I can think of is to check the air filter to make sure it's clean and not restricted.
as far as the brake thing goes, after that, I would shy away from the dealer unless it's for free warranty work...I could replace the entire system three times for that price (gold plated parts?)
Well, like I said, not a solution, but my thinking on paper!!
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Poor gas mileage on my jeep liberty


change your spark plugs if they haven't been changed in awhile. check your tires for the propper psi there should be a sticker on the inside of your drivers door that will tell you recomended air pressures go by this not the recomendations on the tires. also where are you getting you gas does it contain ethanol sometimes this can burn faster.

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1 Answer

Gas mileage dropping


While changing all the filters and things, did you change the fuel filter? It could have just been poor quality fuel which can be caused by getting fuel from the bottom of the barrel so to say. If the station you got the gas at was getting low there is a chance that there was water in the fuel. Normally this would cause the vehicle to run a little bit rough, but not always. I would run another tank of fuel through it and see what you get on a second tank.

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