While looking at A6 Avants last night I cam across a really nice fully loaded A6 4.2 Quattro. It had recaro leather, tv, dvd, sat nav well the list goes on. It also said it was 340bhp, is this correct? Anyway I was looking for a 2.5TDI 180bhp to begin with but when I came across this I thought Mmmmm LPG it & I will have a nice V8 with diesel economy & all that power. I looked at some figures online & it said that the 4.2 V8 gives a combined 21mpg so I figured take a few mpg off for the lower efficiency of LPG & double it as it's half price should give you equal to 36mpg. Isn't that about the same mpg as a 2.5TDI 180bhp? Anyone got one of these on LPG as it needs real ownership to truly confirm what it returns in real life?