I finally bought myself an Enfield, had it about two months and have done just under 2,000 miles on it. That includes a 900 mile trip back to the UK two weeks ago.
I rode it around lh shift for three weeks before i fitted the RH shift kit I bought with the bike. I have to say I now realise that my dislike of the BMW was as much to do with bMW being too big, too heavy and too unergonomic for me. Sadly I had blamed all my woes on the left shift. I actually was at home on the Enfield with a left shift, but now gearchanges just happen as does braking, I dont have to think about it anymore. I really feel at home and as one with what I think of as 'my little bike'.
The trip to teh uk consisted of 400 miles in the French hot dry summer and 500 miles of winter rainstorms in the UK. During that time my (original) rear chain went from usable to worn. The 14.5 litre tank gives a good range.
For the 894 miles I used 43.1 litres of fuel. I make that to be about 94 mpg

So an 18 litre tank would give me a good touring range. On teh good french roads I was poodling along at around 60mph, which is aboutthe same as I would do on the BMW. The BM of course could cruise much faster when i wished. The Enfield had plenty in reserve, it just seemed to want to run at that speed. I think it may be just a bit overgeared as it needs noticeably more throttle to maintain 60 up hill than down it. Generally it slows going up, and speeds up coming down. When I got it at 6800 miles I did a full service on it..and checked and adjusted the tappets. Now at 8200 miles it has not used any oil, and I havent looked at the tappets. ( starts easily on the kickstart) I noticed the chain when I went to clean the bike.
The bike does not leak oil. Yet.
which is a pity, as an engine breather blowing on the chain would be an improvement.
I think, when it comes to changing out the sprockets, I may reduce the gearbox sprocket by one tooth to make slow speed riding smoother and gradients easier. After all, I only have 25hp to play with