Question:

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.)?

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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. ?

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


  2. 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

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