[see below ] where i actually got 323kms [ and this was normal ] on 49 litres which was around 18.4 mpg !
I think the secret is to not use on very short runs ie 2 or 3 miles where you never even get in top let alone lock out.
I think with use like max suggests then 345 miles on a full tank of 65 litres is just under 24mpg which is ok.
I forgot that my consumption was based on 49 litres not a full tank.
Let's remember though 450kms is still only around 280 miles so a full tank of 65 litre [ 14.29 galls ] equates to 19.5 mpg.
But also remember we don't buy bongos for their economy and they are no worse than most of their peers.
Apologies if my earlier posts on this topic confused the issue.

http://www.igmaynard.co.uk/bongo/forum/ ... 12&t=51898