In article ,
Another John wrote:
In article ,
Tim Watts wrote:

On 06/03/17 09:45, tim... wrote:

[1] my own figures for when I ran a diesel was 66 mpg on long runs,
32 mpg for town driving - this predated turbo diesel, the addition of
which makes the numbers a bit closer

My car is horrible around town (26 mpg) but I have a run to Devon next
month so that should be interesting.

I'd like to know speeds, when people quote MPG. It's very hard (I find)
not to do 80-85 on motorway runs (which are the favourite for good MPG).
The higher speeds would surely negate MPG gains?

while the engine might like you doing 80mph, the wind resistance goes up as
a square function, so is considerably greater at higher speeds.

(I'm not getting better than about 52mpg on the 300 mile run to Kent
from 't'North.)

John

--
from KT24 in Surrey, England