I've been seeing some pretty amazing numbers coming from stock block S550s running e85 tunes. I do like to drive my car from time to time and with only having a 14 gallon tank and getting 14 miles per gallon I fill up every other day, if I daily drive. I can only imagine having to fill up daily if I had an e85 tune (might not be that bad). I'm leaning more towards a Methanol injection kit. Anyone have any input / experience with either?