My last fill was ~27 gallons. It cost me just shy of $61. With my lead foot (acceleration, not speed), that'll probably get me around 250 miles in this relatively flat town. It's my DD now, promoted from resto project to resto project + DD.
Of course, if you compare the fairly low insurance premiums (~$150 for 6 months for ) to the full-coverage costs of a financed new vehicle - and the cost of taxes/plates/tags for a new vehicle - and the cost of a newer vehicle loan payment - and the hellish depreciation that you will eat on a newer vehicle, it doesn't seem too bad to pay 60 bucks for a tank of gas, even when you drink it at about 10mpg.
In any case, if I valued a cheap gas bill above all other concerns, I'd drive my econobox instead of the wonderfully handy, multi-purpose Blazer.