IIRC Saab used to have a drive line that "free wheeled" anytime you took your foot off the accelerator pedal but it was never popular. To place an automatic transmission car into neutral at each approach to stop to save gas would result in excessive wear to the mechanism, increase wear of the brakes, and prevent you from accelerating away from a danger that suddenly appeared from the sides or rear. Definitely not recommended.adam2 wrote:UK fuel prices are broadly similar to those in France.
Many UK drivers could save fuel by more sensible driving, for example by coasting towards red lights and stop signs, rather braking hard at the last moment.
More fuel could be saved by driving at more modest speeds, 80MPH is common on motorways, despite being illegal and wasting fuel.
I presume that circumstances are similar in France.
As to driving 80 MPH time is money and drivers balance the extra fuel cost against the value of what they are doing at their destinations.
Real fuel savings are made at the point of vehicle purchase and that is effected by what the buyer expects the price of fuel will be over the time they expect to own the vehicle.
A few years back I had a crew of UK construction workers demonstrating a new process for bridges. Delays and such kept them in the US for the better part of a week so we chatted more then a bit. They were amazed at the proportion of SUVs and pickup trucks driving over the bridge and when asked said their own personnel family vehicle back in the UK was a tiny Fiat. These guys played Rugby in their spare time and the vision of them squeezing the four's shoulders into a Fiat to carpool to work was laughable but apparently routine for them.