I'm going to have my first 700+ tank!!! I've got 670 now with one bar left. I wish I had "super-filled" the tank last time (1.8 gallons past first click-off). I only put in 0.85 gallons this time. If I had added the extra gallon, an 800 mile tank would have easily been possible.
Regarding the question on how far you can go with one bar left... well, the fuel light illuminates with two bars left, and there is supposed to be about a two gallon reserve when the light comes on. Mine dropped to one bar within a mile of the fuel light coming on, so I'm pretty sure I could go between 100 and 120 (current tank is 61 mph
)... but I wouldn't dare try it!! Once that last bar goes away, I get scared. Once I went about 30 miles with no bars and was a nervous wreck by the time I got to the station! Someday I'll bring a one-gallon gas can with me and I'll be more brave!!