I thought about water injection but figured it would be a pain to keep up with and install compared to the mabey 1 mpg it would give me if that.

It is cheaper to operate now than before.

Conservitivly, under the same driving conditions I am getting 5 or more mpg better in town or highway so...

27 / 3.45 = about 12.7777 cents per mile

VS

22 / 3.25 = about 14.7727 cents per mile

On a 15 gallon fill-up I save about $9.58 over what it would have been before. Plus it makes a nice chunk of extra hp over the old motor so I don't mind the premium

On top of that I save a couple bucks on soda and candy bars because I fill up less often