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425 for a 26 gallon tank.
It depends on the size of the tank.
1500 miles @ 25 miles per gallon = 1500/25 = 60 gallons 60 gallons @ 3.50 per gallon = 60*3.50 = 210
12 miles per gallon
Assuming that 25 miles per mile is meant to be 25 miles per gallon(!), 1500 miles @ 25 miles per gallon = 1500/25 = 60 gallons. 60 gallons @ 4.00 per gallon = 60*4 = 240 units of currency.
$300
$240.
$333.33
1500 mi/25mpg *$3.00/gal = $180
At $2.75 per gallon, this trip will cost $147.32
$750.
1500/28 = 53.57 gallons.