I think the closer I get to an empty tank, the closer to an actual empty tank I get. My computer used to show zero miles till empty and I could fill up 19 gallons. I stretched that a few times and now mine says zero and I fill up about 22.5 gallons, maybe a little more. Maybe it adjusts according to how much you go past the zero mark in the computer. I dunno.

The extra fuel in the tank is supposed to help cool the fuel pump. Kinda odd to me but I guess that's a common thing. Hope my fuel pump never goes out.

My theory is that it's also there to help you not get stranded without gas. Sure, when you are cruising around in an empty truck, you might be getting 18 mpg so 5 gallons left over when the gauge says empty is a lot of extra gas. A car will usually have around 1.5-2 gallons left to get you around 35 miles in case you are between towns. But how about when you are towing say 10K pounds? You are probably getting like 8mpg towing that much weight. Now when the gauge reads empty, your 5 gallons will get you an extra 30-40 miles to another gas station. So having 5 gallons left in the tank isn't a bad thing at that point.

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2007 SR5 Crewmax 5.7L 4x4
Mods: nerf bars, Truxedo tonneau, radar detector power, 3M clear bra, fog lights, black billet grille, rear differential breather, parking sensors, Line-X, power tailgate lock, hood safety latch mod, one off driving lights behind grille, Pioneer NAV w/ OEM camera, Flowmaster 50 SUV dual/dual, blue LED dash lights, Volant CAI, Llumar tint, CompuStar Pro alarm, ProComp 6066 20" wheels, Cooper Zeon LTZ 275/60/20 tires, OME HD coilover lift, Firestone helper air bags, stereo cable lock, Tekonsha P3 brake controller
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