isotopeman wrote:How do the Audis have AWD and turbo and still get 30+mpg?
The same way I think Toyotas are getting such good mileage: I think they're running lean.
As most may know, Toyotas have had a problem with sludge, and it's not just the old 3.0 V6. I saw an 05 Corolla the other day which had sludged up completely, not quite to the point of seizure but close. Needless to say, the genius that bought it hadn't changed the oil since he bought it (it had 18k miles on it and we told him to fuck himself when he wanted a new engine under warranty), but I'm sure we could get away with running our engines for 20k without changing the oil and we'd still have halfway-decent running engines. I think the reason is that Toyota engines run too hot, and running them lean will of course cause them to run hotter, and by running hotter, you break dino oil down into sludge faster.
I don't know if Audi is doing the same thing, but if they are, they probably get away with no sludge by using synthetic.