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07-04-2008, 11:16 AM #1
How big is the fuel tank for 2008 Silverados?
When my salesman sold me my truck he informed me the gas tank was smaller this year and was 21 gallons, but after filling up a few times, I have put in 22 gallons plus. I was reading and saw that it still is 26 gallons. If that is the case does anyone know when the fuel light comes on how many gallons are left? I am trying to figure out my mpg before I put on the CAI and the Fitch Fuel Catalyst.
08' Silverado Ext. Cab
Flowmaster 40 series duals
Windows tinted 5% all around
Garmin nuvi 260 GPS
K & N Air Flow
Sirius Stilletto 2 Radio
07-04-2008, 02:42 PM #2
Obviously, your salesman got his facts confused. Rest assured, this is nothing unusual.
For calculating MPG, you're assuming too much accuracy from your low fuel warning. It's going to vary with each individual vehicle. What you want to know is how many miles can you go with the gas remaining. Doesn't your owners manual give an estimate?
To accurately determine the gas left, drain the tank immediately when the light comes on. However, that's a pain in the butt. You can fill-up when the light comes and subtract the amount from the total capacity, but then you're guessing that the total is 26-gallons. It's going to be close enough to calculate additives. But, if you really want more accuracy, than a 26-gallon guess, you can determine your usable capacity by running it dry (another pain in the butt, but pushing is easier than draining) and then fill-up.Are we having fun, yet?
07-04-2008, 08:45 PM #3
Good advice. I guess I was not being meticulous enough when i figured mine. I just filled up, all the tank would hold and set the trip odometer and drove till I needed gas and filled the same way and used the miles divided by gallons method.Worked for me.Chris S. The GoFastPadre I like to drive fast and I've got the speeding tickets to prove it. 00 Sierra Z71 ECSB K&N CAI Pacesetter Shorties (soon to be replaced with LT's) Magnaflow HFC's Flowmasters with True Duals and H-Pipe more mods to come
07-05-2008, 01:35 AM #4
My understanding that there are two tanks in the NBS's , the standered one and a big one optional only, the standered one is the one you and me have on our trucks, and I am sure it is more than 90 Leters because I filled it with that, and this is around 23 gallons, and I guess 26 gallon is the size of the tank.
I drove the truck around 20 Miles after the low fuel worning and it didn't stop,and I guess that is more than needed to find a gas station if you are not on an offroad trip and in that case you should have addetional gas tank with you.
Don't leave your normal tank less than 25% remaining, evryone says that's a bad thing to do since all the dirt and remains in the tank will go into the car fuel system.2008 Sierra SLE
07-07-2008, 05:36 PM #5Are we having fun, yet?
07-08-2008, 09:36 AM #6
26 Gallons. You can get an option 34 Gallon tank if you have the extended (8') bed.
And don't run your tank dry to determine your mileage. Fill up. reset trip meter. When you get near empty, fill up. View # of miles driven on trip meter and divide by # of gallons in tank you just filled up with. That gives you your mpg.
If you've changed from stock tires, get your speedo recalibrated.
Other way you can check speedo accuracy is if you have a gps unit. ;)
'08 Chevy Silverado LT2 Extended Cab - AVS Hood Deflector, BedRug Mat.
'06 Chevy Equinox LS - Stock! (Wife's car)
07-08-2008, 10:06 AM #7
11-03-2008, 07:55 PM #8
the driver info center is pretty accurate, if you dont have on e you can buy the pannel and buttons for less than 100 bucks, the harness is already there just plug it in and your done2002 silverado 4.3 5spd / off road y pipe, flowmaster split duals, K&N filter
ported throttle body , ported heads and intake < all by me
11-03-2008, 08:30 PM #9
yea im suppost to be 22 but i have filled about 2908 5.3 silverado...toyo m.t 33 12.50 18 rockstars...leveled with 2" blocks...cherrybomb catback...6k hids
11-05-2008, 02:38 PM #10
My low fuel light came on and i went about 13 miles on the hwy.When I filled it up it took 25 gallons.So I wouldnt go too far when it comes on you will be walking or calling onstar.
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