1ton-o-fun
Automotive Durability Tester
Ya don't even have to say my name 3 times in the mirror!
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TBH, I never investigated mpg loss on a TBI engine, good point here.find someone to do a tune, they can enable things like "highway mode" etc that will bring up your mpg. FWIW, while LPG has it's pro's one con is it's usually it gets 30-40% LESS mpg. IMO you really need to build a high compression engine (11:1+) to really extract all the benefits out of LPG.
It's all about the money. Someone might or might not have a kit down here.Having gone a little ways down the TBI modification path, I'd leave it stock or yank it to install aftermarket injection. I don't know how feasible aftermarket FI is for you.