Got my 3.5 110 with gas conversion and it runs very well.. the gas is set a little rich as I broke the adjuster off and cant weaken it off again:doh: but never mind. It has two gas tanks and a petrol tank, I can switch to either pertol, lpg or propane and it runs fine on any. The ign timing needs to be advanced a bit more ideally but I cant be bothered altering it every time I switch back to petrol so it's slightly retarded on gas which reduces power a bit over petrol.
The twin mixer ring system works fine and it never back fires, never overheats and has been reliable. I get my gas cheap so the fact that it does 9mpg round town on gas dont matter much.
If I was paying full price for lpg then I would rip the V8 out tomorrow and put the diesel in as 25 to 30 mpg is far better than 9 to 12 which is 20 ish average equivelant.
I have never bettered 13mpg even on a run using gas, but I suppose if the mixture was fine tuned then a bit more economy would be there to be had.
The 110 has a Disco 1.2 transfer box behind an LT85 and is lower geared than a Disco but higher than a 1.4 110. If I drive carefully or normally then the mpg is no different but urban driving with it's stops and starts and not often getting into 5th gear is never going to be economical. The oil remains clean all the time so must be better for the moving parts in the engine.
The engine isn't standard though, it has 4.6 heads and a different cam so that wont aid economy will it, it dont half go though, even on gas.
The 3.9 Rangie I had on gas was on injection and was no better economy wise, it was still single point mixer ring though, I got 14mpg on gas at 55 to 60 on a motorway run once.
If you buy a converted motor then you cant loose really, no payback time.
