I had a land rover than I had converted to LPG - it was much cheaper than petrol and I could get a comparable mpg to petrol so paid for itself in 12 months.

I had twin underseat petrol tanks (ex MOD) and the lpg tank was in the rear bed. Gave me a great range, and removed the anxiety of finding an lpg station to top up (there were four near home, work, or mid commute). However, at least 3 of them are now gone.

There are plenty of kits out there for both carb and efi models. Tank wise, you could go for a toroidal tank which would fit where the spare wheel should go, or a small custom made petrol tank next to a small lpg tank.

"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10