Just took truck in for service and some warranty work last week and reflash done at same time seems to run better at low rpm, but at cruising speed my rpm are up over 250 rpm 60 mph?
Have 3.73 with auto, rpm is around 2000?
Not to happy about that, has anyone else noticed this at all?
14000 miles so far and milage is not so good overhead reads about 11 -12 mpg maybe up to 15 on highway.
Have not been on a long road trip for quite some time, most of my trips are about 10-20 miles.
I drive with a egg under my foot all most all the time, well I do let it breath now and then .

 

That's not possible, unless your torque converter is slipping...or they swapped your tires for smaller ones while you weren't looking!

 

They could have changed the speedo calibration with this re-flash.
There is room for error when setting up the correct flash file to use.
I would double check what the dealer did by having them pull the original file, the current file and all the available files for your VIN ID to make sure they did not program it wrong.

 

Second PT's response. I also have the 48RE with 3.73, and at 2000 RPM, I'm doing 72 mph.