they are absolutlety crap on fuel my mate had the highline they can sound abit rattly (timing chain)im not biased towards the vr6 as i own a 172 but my mates vr6 obliterated a 172,and we went past a saphy cosworth 160mph this is all true as ive got nothing to gain from lying,but i must say when i had a go in it i never felt in control