What would cause my final RPM and MPH to change? I installed a hotcam kit, stage 1 heads, lts, tuning and a bunch of other little stuff. I used to cruise on the freeway at 80 at just over 2100 rpm. After all of that work 80 is at ~2500 rpm. 65 at 2100 also seems to be much faster than everyone else is going despite it being the speed limit. I have a 1 on my console (a4) so I assume that means I have 3.23 rear gears.

My only guess is that the tuning corrected for a gear change I didn't make (still have 3.23 rear gears). Would that cause such a change? Just curious if it is normal and what might cause it.