Based on $3/gal for gas, your payback period is around 13,000 miles after which the mods will have paid for themselves in fuel savings, assuming you maintain those improved mileage numbers.
Steve
98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
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