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Has anyone heard of the gadgetman.com?
he claims to increase fuel efficiency (mpg) by adding a specific groove in the throttle body near the butterfly valve on certain vehicles?

I know this is the HOLY GRAIL and one of the oldest scams since the internal combustion engine was designed, but  He supports his claims with a lot of data from a lot of people that have modified or had their vehicles modified.

Has anybody ever tried it on the SANTA FE or any vehicle ?