The answer for me today was ~60 miles, about 1/2 of it in stop & go traffic. It started to stumble on hard acceleration (is there another kind of acceleration?) so I decided it was time to get gas.
Incidently, I got 330 miles out of the tank, including racing it and towing with it this weekend so thats not bad.
Other than that, I'm glad someone out there was brave enough to drive around and wait until his car ran out of gas, so I wouldn't have to do it. *makes a note*. I will now set trip meter B to 0 when my light comes on and fill up at 59.9 miles.
2004 Mazda 3S 5-door (2-1-04)
Auto | ABS/SAB/SAC | Moonroof | 6-CD Changer | Xenon | TPMS
The theory is that you have little bits of sediment or debris in every fuel tank and that builds up in your gas tank. People say when you run your tank really low the sediment is super concentrated and can clog your filter or get into your engine.
Maybe that's valid if you NEVER let your gas tank get low and for some reason are forced to (can't find a gas station or something) but my opinion is that if you regularly run your tank low it won't have the chance to build up.