Foxbody Miles per tank?

all highway i got 313 :D with 2.73's.
i average 250-300 if i driivng normal. if im out just having fun. 200-250
now i have 3.73's...havent drove it yet. so idk how much my milliage will suffer.
 
Last time I ever payed attention to it I was driving to the track, full tank, made it 100 miles and the needle was just below the F line. Raced the car all day, drove home had maybe a 1/4 tank and I had a good 250-260 miles on the odometer.
 
I've never clocked it around town, cuz I'm usually heavy footed, but I was pulling 27mpg on a highway trip from Georgia to Texas with a passenger and about 250 pounds of crap in the back. I thought that was pretty decent.
 
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I go by the 150 mile rule, but I usually still have six or seven gallons in the tank when I fill up. In my car the mark below the half tank mark is half a tank, when it gets to the marks just above 'E' the gauge stops working. I found that out the hard way; luckly a cop with a gas can helped me. When I get a new fuel level sending unit I might trust my fuel gauge more.