In a message dated 04/08/2009 18:31:45 GMT Daylight Time,  
[email protected] writes:

I get  45mpg cruising
on the motorway at approximately legal  speeds.




How do you know?
 
I'm not being funny about this, especially since fuel economy is now much  
more of an issue than it was when I started motoring when low 20's fuel  
consumption was quite common in family cars.
 
Detailed records of fuel purchases over a considerable time and distance,  
or expensive metering systems, would seem to be needed to get reasonably  
accurate results - at least so far as overall average economy is concerned. 
Test  meters are the only means of comparing consumption in various conditions 
and the  effect of variables like temperature, humidity, wind, load, etc 
etc.
 
BTW I hope no one out there thinks that to establish the range of a vehicle 
 all you have to do is to top it up and then drive it until the fuel gauge 
shows  half empty - and then double the recorded miles.
 
Michael

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