Remembering why I
dislike working on
AO Silver Member
Join Date: Sep 2001
Not the Alfa, but I had the Jeep converted and TBH, you really can't tell when it's on gas or petrol. There's no way I'd be running a 5.7 V8 on petrol alone. On LPG, it gives the same effective cost as the 166 on petrol, so although it's still painful, it's bearable. On our daily run, the Jeep typically gives about 14mpg. On gas, it's an effective cost per mile of about 23mpg.
I did consider getting the 166 done as well, perhaps a cheaper rig than the Jeep, but in the end, decided it really wasn't worth the cost for us as we do so few miles and kept thinking the car would be going soon...but that was 3 years ago and we still have the 166, so maybe I should have.
Really depends on how you view it I think. A decent system and you won't know the difference, except in running costs. If the capital calculation works for you, then go for it.
Fitting one isn't trivial, although it's not too big a deal for the DIY capable. The trick is making sure it's certified or you will struggle with insurance.