800/20 = 40 gallons
$66.50
At $2 a gallon, about $90.
900 miles / 50 miles/gallon = 18 gallons
$333.33
$300
$240.
$128.53
it all depends on how much a gallon of gas costs in your area.
(835 miles) x (1 gallon/20 miles) x (3.75 bux/gallon) = $ 156.56
$464.47
$168
700