Question Author
Sir Knobby,
No I`m not that sort of person at all, I don`t know how you managed that leap of logic with the sort of thoughts you seem to have. You didn`t however manage to contribute to the question.
TWR. I think you may mean car (petrol) consumption can be decreased (not increased) by your methods, which are by the way, pretty obvious, but perhaps you didn`t read the question.
Anyway, it seems the general opinion is that it would save about 1% per year, or in my case about �15. This of course would mean the Government may have about �2 less of mine to waste. (ANY Government).
So, on balance, I`ll keep my lights off.