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I compaired a MJ17 vs. a Action Fab 15 some years ago. The mph was exactly the same.

About a year ago I compaired a MJ20 Vs V4R. I picked up 4mph.

I then compaired a V4R vs a PTE FM. Exact same mph.

I do feel (in opinion only) that above 125mph or so a FM would pull a little more MPH.

The V4 and V4R's are excellent units, but be prepaired to wait for months.
 
Sorry, I'm a little unclear. Did you go 4 MPH faster with the 20-row Jackson or the DeQuick V4R?
 
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