ARWadworth presented the following explanation :
I have just done my first fill up on a N reg 1.6 Honda Civic and it shows a
return of 27.5 MPG. This seemed a little low to me. I am sure when I used to
drive cars of a similar age I always managed a minimum of 30 MPG and a little
more on a motorway run.

My 3litre V6 does that mpg.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk