For the Imp you should get a 1+L automotive engine that has the best choice of gearing. BSFC isn't going to vary a whole lot between engine families built within the last decade or so, but gearing can, and that's where you are going to make or break it in terms of mpg. A 750kg car should be able to get great mileage with low enough gearing.
Quote:
Originally Posted by Frank Lee
I was going to mention the Gold Wing.. but my 1100 and I guess most all of them don't return very good fe, usually in the 30's and I don't think I've seen anyone claim any better than 40. In fact I'm deciding if my bike would run better and more economically if I ditch the 4-carb setup and put a single automotive carb on there...
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Why not go w/ a used set of ITBs, a wide band O2 sensor, and something like megasquirt? It would be a bit pricey at ~$200+, but you could go as lean as you wanted to.