>Another advantage to propane is that because it burns more cool than
gasoline you can run higher compression ratios. I used to run with some guys
that had propane carbs on their >4x4's and they could run domestic(American)
V-8's at 11.5:1 compression on propane with no problems. The draw back is
finding a place to put the fuel tank, and of course putting >up with the
stench from the additive put in to help identify leaks.

There is no bad smell unless you have a leak.  Which you don't want anyway
:)

Propane engines can have a high compression ratio because it has higher
octane than gasoline, generally around 110.
I've always wanted to convert a VW 2.0 16V engine, it has 10.8 CR (Canadian
version) with knock sensor.

Turbo charging a propane engine works good because of the high octane of
propane.  Plus, most propane fuel systems are good for a minimum of 250 or
so hp.  You don't
have to worry about fueling problems like you do with EFI gasoline cars.

In Alberta, Canada:
Gasoline $0.70 liter
Diesel $0.56 liter
Propane $.038 liter

Gary Lee
http://www.telusplanet.net/public/gary2a/rack/vanagonrack.htm