Hi Redbow.
Sorry, the attached tune may have some redeeming features, but mileage isn't as great as we thought.
Our current tune probably has too much timing to use on anything but 91+ octane and has some issues. We were using VE from the Volt, but cam timing has changed from that a LOT so adapting it from the Encore will be much closer. I'm a week or two away from finishing up cam timing. Since we still don't have a 2nd gen Volt tune to compare to, we're having to do trial and error for cam timing. I have probably burned through 5 or 6 tanks of premium gas just for cam tuning. (I have a 10 minute daily commute so rarely would be burning any gas.)
PM me your email and we can visit.