I used this system on three of my cars.
'99 Suburban - 29mpg
'03 Buick regal - 36mpg
'93 Nissan Sentra - 49.97mpg - older version their injector.
They worked well with fuel grade propane but, BBQ propane seems to clog the injectors periodically. I had to send them back to get them cleaned. The owner has always been real kind in cleaning them for free. The last time I sent the units back, he just sent brand new ones and I never installed them. PM me if you want to purchase one.
The main problem is that propane still costs money. I was paying $11.99 when I first got them and now it's up over $20 for a 20lb tank. It does save money but, I would have to find places that would sell fuel grade propane without road tax applied to it.
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