It's the most economical way to run a v6, that's it.
The fact diesel exists doesn't even come into it for me being honest. Although it would be nice to see 600odd miles range after fill up, even that doesn't compel me to own and live day to day with a tractor, apologies to diesel owners but the very thought just depresses me.
Although BMW's (spit) e39 straight 6 is refined enough, even that is like dragging finger nails down my "mechanical sympathy blackboard", if you see what I mean....? It just makes me cringe by comparison to petrol engines, v engines being the cream.... For me anyway.
If I/we where that bothered, and laid that much importance on economy, none of us would have an omega at all surely? There's more to it than that.
LPG mearly makes the car I want, and the way I want to drive it, more affordable. Simples!