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I completely agree with everything you've said, striker - and in fact, the porsche in question wasn't running LPG, it was petrol 102RON, but i gave that (possibly flawed) example to demonstrate the higher power available with the higher knock resistance of the fuel. A better example is lotus...

Thats not true - BP recently demonstrated a porshe with just engine mapping changes gaining 70bhp running on 102 RON fuel. I think E85 is even higher octane than that...

Ah, but it has the same key advantage as LPG - octane rating. Its very high, so you can run high compression ratios to recover the lost power and also lots of boost can be safely run... Ta, Paul.

Rather than compound charging i want to see a variable vane turbocharger running on a petrol car - they're common on diesels and attempt to have the characteristics of a small turbo at low boost levels and a larger turbo at high boost levels by changing the geometry of the turbine blades...

Thanks for welcome! :) Just wanted to put things in perspective a little bit because its easy to get carried away thinking something (LPG for example) is the best thing in the world, only to be met with a slightly different reality if you don't do your research. Lots of LPG conversions have...

The calorific value of LPG is *lower* than that of petrol. If you convert over to LPG (without making engine changes) you lose about 10% MPG and 10% power. But as you rightly say, the octane rating is so much higher - one guy in the UK running LPG only on his rover v8 is running 12.5:1 and 15...