I have a V40 T2 automatic and I found that if you move the gear lever to park, take the foot off the brake pedal the engine will not restart until either the lever is moved from park or the throttle is blipped. I am averaging about 37.5mpg with a mixture of all sorts of roads. Town work is quite heavy - low 30's. Best consumption about 47 on a long trip. I found that it took a few thousand miles before everything bedded in for descent economy figures.