How far can you go w/ a full tank of gas?

[solidgun]

Is there a significant drop from the 17" to 20"? I have factory 20" chrome so I wouldn't know the difference, but I hesitate moving to 22 or 24s because of the significant drop in gas mileage.

 

[Alex33]

I do 340-350mi/tank city driving and 370-380mi/tank hwy driving when the light comes on, but from what the previous owner tells me, there are another 50 miles to be had after the light first comes on. So I assume it's capable of 425-430mi on a full tank. I don't know about all that since I fill up whenever the gas light comes on and usually only put in 20-21 gal instead of the 26 it holds.

 

[GMTech48]

I have heard this from lots of people but no one ever seems to have a good answer for why. Can someone shed some light on this for me. In my 2001 Mercury Cougar (daily driver) I run it down "0" miles till empty on pretty much every tank. It has a 15 gallon tank and I put 14.5 gallons in it almost every time. The car has 106,000 mile on it and has had ZERO issue with it other than people running in to it. In the '07 Yukon it usually stays above 1/4 tank.

the reason being is the electric fuel pump in the tank is cooled by the gas....run it low & the pump will run hot, shortening the life of the pump.

 

[Black Dog]

the reason being is the electric fuel pump in the tank is cooled by the gas....run it low & the pump will run hot, shortening the life of the pump.

Excellent answer, I guess that is to say that at a certain low point the pump is no longer completely submerged? Another reason I've always thought is that the sediment in the tank will be in higher concentration with little fuel, and it will pick up and clog the fuel filter faster. True but I have to say that a newer vehicle probably doesn't have a whole lot of gunk in there since it's still a newer system. On an old car it could be major. So in this application I'd think GMTech's reason is definitely the big concern here. You know, sometimes I wish there was a pre-tank filter to catch who knows what from the pump before it hits the tank. I'd like to test it from the pump sometime but then again one station's tank system could be much dirtier than the next. Me like clean systems.

 

[Gonen Liberman]

Experiments

I decided to test out my 2007 Tahoe on our last family trip...See what the maximum distance would be on the freeway. No A/C, windows very slightly open and only freeway driving at 65 (was tough to stay this slow). Got to 361 when the guage hit "E". Turns out there was a cheep gas station in the area where I hit the "E" - 3.94/gal. Not a bad deal.

 

[strangeengine]

Excellent answer, I guess that is to say that at a certain low point the pump is no longer completely submerged? Another reason I've always thought is that the sediment in the tank will be in higher concentration with little fuel, and it will pick up and clog the fuel filter faster. True but I have to say that a newer vehicle probably doesn't have a whole lot of gunk in there since it's still a newer system.

I had this exact conversation with a good friend of mine who's a crack BMW mechanic recently. He pointed out that modern fuel systems are return-type: fuel is fed under constant pressure to the injector rail and excess fuel is shunted back to the tank via a return line. This keeps the gas circulating all the time so any sediment is trapped by the fuel filter instead of building up in the tank.

No longer an issue.

 

[IronMedic]

i have done a combo of city/hwy driving and so far, i am at 220 miles at half a tank in my denali XL. i drive conservative and dont floor it. ill report back later when i get more numbers in.

 

[ZX1100F1]

2007 Tahoe, 20" wheel/tire and 4.10 gears.
Best tank yet was on a road trip between SLC and Primm Nevada, got 461 miles on a single tank cruising at 80mph, tank was depleted upon filling at Whiskey Pete's.

FYI: The 2007 Tahoe uses a returnless on demand type fuel injection system.

 

[strangeengine]

FYI: The 2007 Tahoe uses a returnless on demand type fuel injection system.

Interesting - thanks for posting.

 

[kutza]

just did a road trip, on I-64 and I-95, 385 miles in 3/4 of a tank.

 

[Dirty brown hoe]

when i had good year LS2 tires i got about 390 highway miles...now with goodyear silent armor im getting bout 340 highway miles...

 

[07SuburbanLTZ]

I get high 3's on a tank.

Last fill up was 360 miles and only used 24.? gallons.