how many gallons are our tanks?

**k5greek** · 01-25-2010

I bought the gp as a beater and it gets decent mileage. I usually avg between 18-20ish mpg. The problem is I can only get maybe 200 miles out of a tank. I hate filling up so often.

I looked up and saw that the cars came with an 18 gallon tank. Whenever I let the car run low and the fuel light comes on I dont think Ive ever put more than 12-14 gallons in.

Even if I got 15 mpg with 18 gallon tank I should be able to go 270ish on a tank. when i hit 200-220 my light comes on. Whats up? Did these cars ever come with a smaller tank for some reason?

Car is a 98 GP GT

**putskijr** · 01-25-2010

Do you calculate ur mileage? Or go by the monitor? And yes 18 gallon tank. My moniter shows 20ish and I get like 15-16 actually

**k5greek** · 01-25-2010

Do it on my phone everytime I gas up. No monitor for me.

Even if I only got 15-16 I should still be able to get more than 200 miles out of a tank.

**putskijr** · 01-25-2010

Hmmm ya idk I got 220ish on my last tank. I don't remember how many gallons it took to fill tho

**cerick08GP** · 01-25-2010

My guess is the fuel gauge is off. I had a Buick once that could be bone dry, and the fuel gauge would show over ¼ tank.

**Madness** · 01-25-2010

I noticed the same thing when I bought my 03 GT 4dr. After putting almost 40,000 miles on it, I think there is more fuel in the tank than the gauge shows. I have never put in more than 15? gallons in it.

If you are dividing miles by the number of gallons at the next fill up-that is your mileage. Go as long as you want on E at your own risk.

In the mid 90's, I had a 88 Buick Regal Limited without a working odometer and fuel gauge! BAD COMBO!

**Haulero** · 01-25-2010

I don't really know exactly how many miles I can go because my fuel gauge is broke, it works but once the gauge goes down to 1/4 it start going up until it read full. So I normally fill up when the gauge reads 1/4 just in case, I can drive 300 miles, I'm sure I can go more but I don't want to risk since the gauge don't work good

**matt5112** · 01-25-2010

apparently 97 is 18 gallons and every other year after is 17.5

Forget where i heard that though

**ZR1Vette09** · 01-25-2010

06 is 18 just for reference^

Anyways, don't forget about the reserve on the tanks. Even when mine is almost on empty I still have 2-3 gallons left. Granted, that shouldn't matter if you calculate mpg right. After dealing with bad gas gauges in all 3 GM cars that my family owned (2000 chevy blazer, 2001 olds silhouette, and 2002 saturn L200), i wouldn't trust the gas gauge to ever be right.

**rynoman03** · 01-26-2010

I know this sounds bad but when i've been low on dough i've ran my car past E several times and still had gas to make it to work until my next paycheck came. The most i've ever put in the car was 15-16 gallons and it seemed like it took forever to fill up. The light comes on when you have drank about 12-13 gallons it seems like.

**Zef_66** · 01-26-2010

GM lists the fuel tanks to be 17.5-18 gals. Not sure if that is without the fuel pump in it. Or just the tank. Regardless, that is the size.

For me, my light comes on when I have used around 13 gallons. But I can easily keep driving and put 15 gallons in or so. The tanks have a reserve and the light comes on early so you don't run out. Typically I get 320-360 miles on a tank. I just filled up last night with gas and put in 14.3 gallons, and had 347 miles on the odometer.

**k5greek** · 01-27-2010

Yea I forgot about the reserve. I think I may try to go a little further and see how that goes. Just not sure by how much.. Maybe ill try 250-275ish and see what happens.

**BoostedComp** · 01-28-2010

hmm i thought it was a 17 gallon tank... lowest i ever got was on a road trip home.. there hasnt been an exit is almost 20 miles i finally got to one and put 16.4 gallons in... talk about thirsty

**tigger** · 01-31-2010

i usually average about 3oo on 14 gallon but like everybody else the most i ever put in was 14.7 so ive never trusted it past 300 -310

**Gmohre001** · 02-02-2010

I made it too 330 miles on my way to school and ended up running out of gas.....

my gas guage doesnt work..

**rocafella2032** · 02-02-2010

i put 9 gallons in my tank today and its almost full

**Haulero** · 02-05-2010

Originally Posted by rocafella2032

i put 9 gallons in my tank today and its almost full

??? Your tank was not completly empty? a little over 1/4? that is kinda weird, it takes more than that to get a full tank unless your tank was not low. I've put like 11 when my gas gauge shows 1/4

**Tommyp2010** · 11-27-2010

ok not to bump an old thread, but when I fill up my tank when my gauge is completely on E, I can never put more than 12.3 ish gallons in. If we have a 17.5 gallon tank, does that mean my gauge is essentially broken? I find it odd that my gauge will read all the way from empty to full but I can only put in 12 gallons.

**matt5112** · 11-27-2010

there IS a dead zone but when mines LOW i can put around 55 litres in.

thats 14.5 gallons.

**blueguy** · 11-28-2010

sh1t.

I've put in 16 week after week...but my buddy never puts in more than 13 gallons and he can have the light on and I'll be around an 1/8. I hate these cars.

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