Version 5.o feels (seat of the pants) like my best tune, where version 6.0 had too much timing up top and broke apart. I am presently mixing 4 gallons E85 (85% test) to 6.5 gallons 93 octane. I have uploaded Version 7.0 which I am told will not have the up top issues that Version 6.0 had, and I have yet to datalog.