Well, It's a dog of a different stripe, but when I did the top end of my RD the last time (Number 10 at least) I was down to about 15mpg for the first 250 miles or thereabouts. (Takes a really long time with only a 2 gallon tank to get anywheres...)
New top end, new rings, etc. I wouldn't say 20 mpg is unreasonable for the first couple of tanks...
--Vince
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"Sometimes it is better to say nothing, and let people think you're an idiot, than to open your mouth and prove it."
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