"will $5k pay for 2 mpg?"
Let's assume the fix will decrease fuel specific range by 2 MPG regardless of conditions, what's your pre-fix MPG?
Old MPG -> new MPG (old Gal/100mi -> new Gal/100mi): Fuel consumption increase in Gallons per 100 miles
50 -> 48 ( 2.00 -> 2.08 ): 0.08
49 -> 47 ( 2.04 -> 2.13 ): 0.09
48 -> 46 ( 2.08 -> 2.17 ): 0.09
47 -> 45 ( 2.13 -> 2.22 ): 0.09
46 -> 44 ( 2.17 -> 2.27 ): 0.10
45 -> 43 ( 2.22 -> 2.33 ): 0.10
44 -> 42 ( 2.27 -> 2.38 ): 0.11
43 -> 41 ( 2.33 -> 2.44 ): 0.11
42 -> 40 ( 2.38 -> 2.50 ): 0.12
41 -> 39 ( 2.44 -> 2.56 ): 0.13
40 -> 38 ( 2.50 -> 2.63 ): 0.13
39 -> 37 ( 2.56 -> 2.70 ): 0.14
38 -> 36 ( 2.63 -> 2.78 ): 0.15
37 -> 35 ( 2.70 -> 2.86 ): 0.15
36 -> 34 ( 2.78 -> 2.94 ): 0.16
35 -> 33 ( 2.86 -> 3.03 ): 0.17
34 -> 32 ( 2.94 -> 3.13 ): 0.18
33 -> 31 ( 3.03 -> 3.23 ): 0.20
32 -> 30 ( 3.13 -> 3.33 ): 0.21
31 -> 29 ( 3.23 -> 3.45 ): 0.22
30 -> 28 ( 3.33 -> 3.57 ): 0.24
29 -> 27 ( 3.45 -> 3.70 ): 0.26
28 -> 26 ( 3.57 -> 3.85 ): 0.27
27 -> 25 ( 3.70 -> 4.00 ): 0.30
26 -> 24 ( 3.85 -> 4.17 ): 0.32
25 -> 23 ( 4.00 -> 4.35 ): 0.35
).
