I assume at those speeds the air viscosity is more of a problem.
Not being a driver, I don't know, but I suppose the place to do your
speeding then is a very high up motorway!

Brian

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Brian Gaff....Note, this account does not accept Bcc: email.
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"js.b1" wrote in message
...
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.