The sucessfull build thread link on the web site leads to a fellow who got his 50 scooter up from 80 mpg to 109 mpg.
In my opinion there are room for improvement in his build (OČ sensor probably hurts exhaust flow & 24 mm TB is probably on the large side for a 50 4 stroke (although I red it is not much an issue when switching to injection)).
That being said, the % of improvement and fuel price in France tells me it would take 34000 kilometers (22K miles or so) to pay for itself on my 250.
Very tempted but the exhaust layout on my bike is really not helpfull in installing this setup (twin header on a single with no balance pipe)
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