Can I get better fuel mileage

[Waterloo]

I would definitely get that 13 spd kit, I run quite a bit in low 9 on these back roads up here in Michigan, 18 spd. I can see the difference in the fuel mileage when I do this, and for $149 it should pay for itself in no time. The supers, I used to run them, but when you figure in the cost, nah.