For the equasion to be correct the gallons used for each fill must be included, or you can use total miles and total gallons combined.
10 gallons 1300 miles @130 MPG
10 gallons 700 miles @ 70 MPG
2000 miles and 20 gallons is 100 MPG.
Am I missing something?
regards
Mech
edit, oops sorry red devil already covered it, long day today.
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