You are correct Rod,evenwith 3cyl running I should achieve 200ft/min, must have been half asleap when I wrote it.
It would have been good to catch up, I might make it to Temora next year. I am currently setting up the engine in my freinds new nearly completed Lightning , this will have electronic fuel and spark control . After I get the spark maps set up I and trim the fuel maps accordingly I expect to get more improvement to fuel economy in cruise.
Cheers Helmut.