Thats crazy...Ive built a ton of LPG powered cars over the years ...
I think that's the difference right there. You're building these motors up to suit LPG, with high compression, high boost and agressive timing - all things you can do thanks to LPG. I suspect that the cars you've listed were all set up for straight gas too, not dual fuel. When you simply bung an LPG system onto a stock motor and have to be able to run ULP as well, a lot of the really good benefits of LPG go out the window and you're left in campingwithkids' territory.
The increasing of the excise is another problem with LPG, and the fact that regular roadmapped increases were on the gov's plans when they offered the big conversion rebats (in my opinion) ended up with a lot of people converting their vehicles over only to find that the cost of LPG kept going up. To be fair, the fed gov has never hidden it's plans to increase the excise, but I'm sure LPG conversion shops didn't exactly go out of their way to warn potential customers away from them
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That said, I've no experience with the newer injected, computerised LPG systems, other than to know that they're much better than the old mixer systems ever were. I've toyed with converting the notoriously thirsty Pathfinder over to LPG on a couple of occasions, but just can't bring myself to do it. When someone shows me how I can carry a jerry can of LPG, maybe I'll consider it again
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Back on topic - interesting figures Lost. Very interesting indeed.
Thanks!
Matto