3 MPG goes into 10K miles = 3,333 gal. but how much do I save if my new car avg.s 3 mpg more/yr. (at $3/gal.)?

Question

I can figure how many gallons and the cost, between the averages: old - 28.5 mpg, new car 26 mpg. But as a sort of cross reference, if I round up to 3 mpg as the difference, then
how would I set up the problem if I drive 10,000 mi./yr. and if gas were priced at $3/gal. ?

Answer 1

Assuming that the new car gets 3 mi/gallon better mileage that the old:

old:

10,000 miles / 26 mpg * $3.00/gal = $1153.85

New:

10,000 miles / 29 mpg * $3.00/gal = $1034.48

Savings/year = $119.37

Answer 2

figure out how much it costs for each one a year then get the difference in price