to smoke or not to smoke

[gldgti]

maybe going through regen cycle?

[gregozedobe]

I was driving along on the M4 this arvo and a Jetta TDI went past me probably doing 120. The thing was tho they were smoking but it was a puff every 5 seconds or so. What causes that?

Another possiblity is he was doing the "pulse and coast" thing, only in this example he wasn't doing it to save fuel. I had a young bloke test drive my old Laser recently. I couldn't believe his driving style. He was constantly flooring the acclerator, realizing he was 20kmh over the speed limit, so backed off, slowed down, then floored it again - over and over until we got to a corner or roundabout. And that was on a level, straight, 4 lane highway ! I can't imagine what sort of economy he will get from whatever car he ended up buying (my $2,000 1990 Laser TX3 with only 185,000Km was too much of a "chicks car" for his taste).