Re: Gas Mileage and using premium gas

Not surprising, Larry...

same with my Frogeye and '85 GTi. 
Both can get by on 89PON but the Frog idles and runs a lot better (smoother)
on 93, most especially during summer temps. The GTi "wakes up" substantially
on prem. rather than "mid-grade".

Most of the new stuff incorporates auto ign. advance/retard to some extent 
based upon octane, induction temperature
and other "chip" parameters.

Use prem. and you automatically get better
performance but if you keep your foot out
of it, better mileage, octane for octane.

Cap'n Bob
Basic Frog