I've been searching around here and it seems everyones worried about maximizing battery mileage by adding more batteries all those batteries add hundreds of pounds of weight to the vehicle reducing speed, efficiency,safety and most of all EXPENSIVE half the price of the car to get any decent amount of distance untill Li-IO batteries are lighter and cheaper why not focus on the effcieny of the ICE already on board by using fuel enhancers like propane not to replace the gas just to stretch it out even more there are kits avalible for normal cars for under $1k thats still alot but i bet i could be built from off the shelf parts for much less yes this article was written in 1972 and for carburatored engines but the technologys sound Convert Your Car to Propane Propane Conversion Kits Superchips DPI Digital Propane Injection Kit, Car Propane Injection Kits Green Car Congress: LPG Prius Concept Car if this has been discussed before sorry all i found was this http://priuschat.com/forums/prius-main-forum/35855-propane-powered-prius.html
Propane fueled vehicles have their place, especially in that they burn cleaner. But I think that Propane has fewer BTU's per unit of volume than gasoline, and ergo fewer mpg. The idea of converting an already clean and efficient Prius is crazy IMHO. Icarus
I've also wondered about this. Not so much to replace the gasoline but to stretch it out a bit further like neorazz said. I have a propane injection kit and 40lb. tank that I never installed on my F350. I wonder, if I adjust it down low and then up to where I need it, if it would help with the power and mileage.
My gen2 prius also runs on lpg. It's 1/3 the price in Bulgaria LOL!!! The cost per mile is almost the same as running a PHEV prius and doing all the distance on electricity. PS: I live in Greece.