About 16.8 gallons.
420 miles / 25 miles per gallon = 16.8 gallons
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$333.33
(835 miles) x (1 gallon/20 miles) x (3.75 bux/gallon) = $ 156.56
$533.33
$211.20
(1,100 miles) x (1 gallon/28 miles) x ($4/gallon) = $157.143 (rounded)