Thanks for the info. I suppose with all things if you just happen to have a spare or free o2 tank and you can get really cheap refills thats great. 2-10% efficiency across the whole range, more HP, and better emmisions. As long as you invest little, what more or less you gain gives a faster return on that investment.
I guess why this isn't standard stuff is it adds consumer involvement in the refueling process. And leaking LPG or o2 in a crash isn't so good. Not that the tank will rupture, but what safety disconnects will you have that stops leaking the gas on impact?
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I try to be helpful. I'm not an expert.
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