Denver,

Thanks for your Reply. I Understand it is designed for 87.

The 89 Test did prove out to get Better gas Mileage.

Combo of 101.3 Town short trips Avg. 7.1 @40 MPH each and 134.4 Highway @ 60 MPH. Gave me 26.6 MPG. Big Increase over

87. This was run doing the same trips to the same places . As the 89 was. 22.2 on the 87. This Was Shell on Both.

Now that is Impressive to me. As well as a saving of 1 to 2 cents per mile. Cost Difference was 10 cent More per Gal. for 89.