Owner of a 2007 Z06 will be doing 2 trips covering about 6,000 miles from east coast to elevations such as Denver and heat as hot as in New Mexico.

Objective is with the price of high octane gas was to custom tune for all those climate and elevation changes, the summer heat but conserve fuel.

All areas of the claibration had to be touched to assure during part throttle and using cruise control engine runs leaner but does not induce knock but assure if getting into Power enrichment that engine would be safe.

First pass of testing with mileage tune was done with weather about 90 degrees. This way if engine does not have a lot of knock then tune would be close.

As results show even with fuel trims about 5% lean to as much as 8% lean and taking engine as high as about 4,800 RPMs there was almost no knock and the little knock there was was less then 2.5 degrees