Your question doesn't make any sense. Some vehicles get 10 miles per gallon; others get up to 40 miles per gallon. The price per gallon doesn't give any indication about how much gas is used.
Please clarify.
how much gas do you use to travel 172 miles at 4.00 a gallon.
2 answers
If you're asking about 4 miles per gallon -- divide 172 by 4.