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Interesting - thanks.
I have an email conversation started with HPT support. They asked for some data but I haven't had a chance to do it yet.

Just took a look at the downloads page again - they don't list versions, but my install indicates that there aren't any updates available. And a quick grep of the install finds the 4.12.4 version...

Yea, just updated last week - running 4.12.4

I see a <Hot> and <Cruise> modes under Trans -> Shift Scheduling that I don't recall seeing before. But no 4Low

bump ... any ideas?

Hi Folks,
I have a Gen3 5.3L FlexFuel & 4L60e from an 07 Silverado Classic 1500 4WD swapped into a 1993 Land Cruiser.

The swap is running great in high range. But when I put the transfer case in...

Wow, that's crazy! Is it stock? EPA city shows about 14 mpg city (https://www.fueleconomy.gov/feg/bymodel/2006_gmc_envoy.shtml) I've typically gotten a little better than EPA with a stock vehicle.

So I finally burned through enough of a tank to check the MPG with the "default percentage" fuel composition parameter set to 0. It came in at about 13.3mpg, so about a 15% bump relative to other...

Loaded the tune with the default percentage set to zero and zeroed the LTFT and took it out to run errands. Did a run up the highway & some stop & go in town driving similar to the previous log. ...

Hi Folks,
I've swapped a 5.3L L59 flex fuel engine out of 2007 Silverado Classic into a 1993 Toyota Land Cruiser. Put a stage 1 Summit "Truck Cam" in it, and Hooker block hugger headers, but...

So the license is per HPTuners serial number/VIN number combination?

Ok - what if I start with his file? Will that work?
Or does the the write have to be performed by the HPTuners install...

I have a friend do the initial read of my Gen3 LS engine swap, removed VATS, did a few other things, then bought the credits and wrote back to the PCM.

Since then, I bought my own VCM Suite and...