A bloke I know starts his car and leaves it idling while he washes & dries it, which usually takes him the thick-end of an hour.

I would say that he washes his car at least twice a week, even when it's not noticeably dirty.

A bloke I know starts his car and leaves it idling while he washes & dries it, which usually takes him the thick-end of an hour.Then there are the people who let their car run to warm up or cool down for 30 minutes and the old rule of it takes more fuel to start a car than to let it run (only true if the car has been off for mare than 10 minutes).
We have a fleet of the latest model Sprinter vans at work. They are exactly the same. Bloody stupid idea.The gear shift is where the wiper stalk sits on every other brand of car! How amazingly stupid is that? What possessed them to come up with that idea.