Is my P5 focked up or what?

[FLSilverP5]

I highly recomend fuel injector cleaner. I had the exact same problem and fuel injector cleaner helped a lot. Also try filling up one tank with mobile. See the mileage go up as you speak.

 

[orangezoom]

Never trust a fuel gauge.

 

[orangezoom]

I have learned that with my 25 years of being a boat captain

 

[NJP5Guy]

The best I've ever got on a full tank was 320 miles and that was because I was doing like 60-65 on the highway and driving like a granny just to see how much mpg I could get.

Now are you actually calculating your mileage correctly? if you only got 320 miles( going respectable highway speeds) while nearly draining your tank to near empty you obviously either have a problem with the car or you calculated your mileage wrong. make sure you fill the tank till the pump shuts off then hit you trip meter and when you fill up again record how many gallons goes in then divide the miles by the gallons. try it a few times to get a well balanced average. the best i ever got was 445 miles on 11.972 gallons=37.170 mpg. averaging 70-75mph. if you want great highway mileage get a lightened flywheel and accessory pulleys (can't wait till i have the money for those)

 

[Khoifather]

I'll try changing spark plugs to Bosch +4 and use buy that fuel injector cleaner shiet to see if it does anything.

I calculated my total mile by just filling up the tank until it can't take no more. Reset my milage calculator and drive until its near empty and look then I look to see how much miles I drove on a full tank. Know what I mean?

 

[haaswyk]

Now are you actually calculating your mileage correctly? if you only got 320 miles( going respectable highway speeds) while nearly draining your tank to near empty you obviously either have a problem with the car or you calculated your mileage wrong. make sure you fill the tank till the pump shuts off then hit you trip meter and when you fill up again record how many gallons goes in then divide the miles by the gallons. try it a few times to get a well balanced average. the best i ever got was 445 miles on 11.972 gallons=37.170 mpg. averaging 70-75mph. if you want great highway mileage get a lightened flywheel and accessory pulleys (can't wait till i have the money for those)

well i get about 350 miles to a tank ... thats full to empty ... im talking sputtering into the gas station

now i run the AC 24/7 it never shuts off ... i drive like my foot weighs 30000 LBS
and alot of around town
now last month i took a long trip ... all highway doing 65 (my wife hates me going any faster) and guess how many miles i got on a tank


367 miles ... is this good or bad?

 

[Protege52003]

Now are you actually calculating your mileage correctly? if you only got 320 miles( going respectable highway speeds) while nearly draining your tank to near empty you obviously either have a problem with the car or you calculated your mileage wrong. make sure you fill the tank till the pump shuts off then hit you trip meter and when you fill up again record how many gallons goes in then divide the miles by the gallons. try it a few times to get a well balanced average. the best i ever got was 445 miles on 11.972 gallons=37.170 mpg. averaging 70-75mph. if you want great highway mileage get a lightened flywheel and accessory pulleys (can't wait till i have the money for those)

That is the correct was to calculate milage, but that seems very high. I average around 24-27 MPG with a lot of city driving. Last week I went about 418 Miles on 13.4 gallons, which equals 31.2 gallons. That was mostly highway driving around 70-75 MPH with AC on a little. I could never see getting 37+ mpg. Last summer I for 35 MPG while driving 50-55 for over half a trip to bar harbor going up RT 1 in Maine. That was driving like a grand-mother with no revving of the engine/fast accel.

Great for you if you are getting these numbers, but that is way above what you should get.

 

[NJP5Guy]

well i get about 350 miles to a tank ... thats full to empty ... im talking sputtering into the gas station

now i run the AC 24/7 it never shuts off ... i drive like my foot weighs 30000 LBS
and alot of around town
now last month i took a long trip ... all highway doing 65 (my wife hates me going any faster) and guess how many miles i got on a tank


367 miles ... is this good or bad?

well if you ran to near empty, lets say you used 14 of the 14.5 gallons our tanks hold and it was all highway miles then no thats not good. in fact it would be terrible. just barely over 26mpg. even if you only used 13 gallons thats still only 28 mpg. and for doing 65 the whole trip even 28 mpg isnt great but then again if you use the a/c, 28 would be decent. Me, i never use the a/c....never cared for a/c. i don't even use it at home...even when it gets into the 90's.

 

[NJP5Guy]

That is the correct was to calculate milage, but that seems very high. I average around 24-27 MPG with a lot of city driving. Last week I went about 418 Miles on 13.4 gallons, which equals 31.2 gallons. That was mostly highway driving around 70-75 MPH with AC on a little. I could never see getting 37+ mpg. Last summer I for 35 MPG while driving 50-55 for over half a trip to bar harbor going up RT 1 in Maine. That was driving like a grand-mother with no revving of the engine/fast accel.

Great for you if you are getting these numbers, but that is way above what you should get.

I have done some mods to the car which have helped increase my mileage slightly. when i got the 37mpg it was all on the highway heading down to georgia. it was spring time so the air temp was warm(that helps). to georgia and back i averaged 34.9mpg(1565miles on 44.8gallons). my mileage would have been better but i sped on the way home hitting 100mph a few times. So far i have averaged 28.751mpg over 16774 miles. i keep a log of my mileage every time i fill up.

i used to live in maine(went to u of maine in orono) RTE 1 is nice.

 

[Lord_Zath]

I've been consistantly around 360-380 on a tank. I don't really have a secret I don't know; I just get it lol.

LZ

 

[gino]

We've been down this road a few hundred times, but I'll toss in my .02, anyway.

I push the '5, through the gears and on the road. Most of my driving is hiway, probably 80-85% mostly at 70+.

Mods: Injen CAI, Magnaflow CB, overbored TB, ES shorty header. Running NGK IK-16 iridiums. ADR 17/7 wheels with Goodyear F1 GS-D3s at 34#.

Mileage averages 28+-31. Currently, have just less than a quarter tank--if you believe the gauge--and 410 miles on the odo. I expect to refill around 450 or so.

Car's a stick and is pushed. Constantly.

Don't know what the answer is. (scratch)

 

[Bass Addict]

So, are tanks are 14.5 gallons? I coulda sworn they were like 12-13 or so.

 

[Lord_Zath]

I think they're 12...

LZ

 

[Chiguy_2002]

Another thing that can be looked at is gas, what type of gas you put in and where. I have found that the less expensive gas isn't always a deal because I always get really bad gas mileage off of that. I would stay with Shell, Mobil, Chevron...

 

[NJP5Guy]

Yes are tanks are 14.5 gallons. type of gas can make a dif. sunoco is one of the best if not the best.