Damn! Look at the price of gas!!!

[Times Roman]

Tr, I may be mistaken but I believe the formula to compute octane reading may be different overseas. What you say about compression is correct, barring one exemption. Turbos.
European cars typically lean toward turbocharged engines. They love higher octane fuel, in fact they require (stateside) 91 octane minimum.

Around here, you can find 100% gas still. It's .20-.30 higher then e10.

There's also a station close to be that sells 101 octane at the pump. I used to fill up with it on the weekends in my camaro, on the way to the nitrous filing station.

ok, turbos may not increase the compression ratio of an engine, but they do stuff more into a cylinder than normally aspirated engines. which is why they often have lower compression ratios and quite often require higher octane gas like premium.

I've been wanting to get another Harley. a bar hopper, with a super charger. only $45k in my estimation. but I have not been riding much lately....

[lovbyts]

ok, turbos may not increase the compression ratio of an engine, but they do stuff more into a cylinder than normally aspirated engines. which is why they often have lower compression ratios and quite often require higher octane gas like premium.

I've been wanting to get another Harley. a bar hopper, with a super charger. only $45k in my estimation. but I have not been riding much lately....

Yup, my 1991 little 3.0 V6 with Twin Turbos (13g) only has 8.5-1 compression and puts out 400hp. I HAVE to run premium in it or it gets detonation/ping and that will destroy an engine eventually and make it run like crap.
My 1967 Camaro had 12.5-1 compression and also had to use premium although it was not the same premium by today's standard, it wouldn't cut the mustard so to speak. I would have to purchase racing fuel to run the car and put lead additive in it.