Elevation effects on dyno results?

[Extended Power]

How much will 1300 feet of elevation make on dyno results?

I live at 2250, but am getting dynoed at 3550 feet.

I thought it was something like for every 1000 feet, it's 3%???

 

[Extended Power]

I guess just make sure to get both uncorrected, and corrected numbers.
(Not that a shop would ever try to inflate numbers)