[V8] LPG V8's? I think - YES

[NIck Miller]

Well, part of the problem might be they aren't using management to run the
engine after doing an LPG conversion.  Couldn't say precisely,  but I've
seen people over here switch over to E-85 without using a real programable
ems, and instead using various pressure regulator and resistor packs on the
injectors to try and make it work with stock programing, with amusing
results, but often they get it to run...

At least with E-85, the benefits are certainly there in the US.  The stuff
is cheap, and on an Mx-5 Turbo, you drop from about 31mpg Highway to about
24, but the cost is basically comparably low, which is nice.  And in the end
you will make more power with E-85, its 97 octane or so and will net more
power in the end, its only real use.  But you're mileage will suffer even
more, in a turbo car to get the power you are advancing your timing maybe
5-10* more than you could at any given point with normal fuel, and you are
pumping significantly more of it at any given point in the map (in boost
anyway..) as well.  Often a move from 550cc injectors to 800-1000cc
injectors is needed to go from 320 or so hp to about 350-400 when switching
to E85...

But the stuff is neat, useless for what it was invented, but as a government
subsidized race fuel, not half bad.

Propane I've seen used in a few very interesting engines (converted Chevy
502 crate motor) and it can make good power and burn perfectly clean if you
set up the motor from square one for it (the stuff needs high compression,
not like a diesel, but not like a gas burner, either)