Hey nice array of motors friend! Bet you're gutted about selling the zed!! I had a carb 13 several years ago and sold that! Done the whole streetfighter,drag bikes with turbos etc routine and now got a z1000j but pining after another 13.
Regarding fuel, who gives a shit?! If you enjoy driving/riding it ya gonna pay to fuel it aren't you! I've got my cummins Dually, B*w M5 and her indoors I bought a 540 touring to Pootle around in. ( I gotta drive it too,so a corsa is a no