87 or 89 octane to feed the Hemi? | DodgeTalk Forum
Aug 02, 2008 · 34 Gallon tank x 16mpg = 544 miles 34 Gallons x = Difference in miles per tank 68 Difference in cost gallons needed to drive that additional 68 miles at 14mpg That gallons will cost you The cheaper gas will actually cost you cents a mile MORE than the more expensive gas.