On Feb 18, 11:39*am, Nightjar
wrote:
On 18/02/2012 10:51, js.b1 wrote:
There is the german autobahn a short trip away. They have unrestricted
autobahn use - wrapped up in very restrictive and punitive fine areas.
High speed use will get 14-18mpg on many cars.

I was getting around 32mpg at a steady 160kph.

99mph, not that fast and whilst drag is higher it is not that much
higher than 75-80mph.
It is as you pass 140mph that drag takes over, bhp required rockets
and mpg begins to collapse.