LMM Fuel Economy

[Sivrug2]

There is a tattle tail feature on the LMM's that keeps track of the programming/flashes. This was relayed to me by the shop foreman and friend at the local GMC dealer.
I recently did a turbo back exhaust and installed a "Spare" computer that was programmed mild upgrade/tow.
Hand calculated my mileage in town is up 1-2MPG on the highway 5-7 MPG increase.

[Ric]

There is a tattle tail feature on the LMM's that keeps track of the programming/flashes. This was relayed to me by the shop foreman and friend at the local GMC dealer.
I recently did a turbo back exhaust and installed a "Spare" computer that was programmed mild upgrade/tow.
Hand calculated my mileage in town is up 1-2MPG on the highway 5-7 MPG increase.

will the tattle tale feature void my warranty if I install one of these programmers ?

[SlimWallet]

New 2008 GMC 2500 DC Crew cab....Colorado

First tank....mt, mixed town and highway.....16.2 mpg

Second tank.....mt... up the mountains to go fishing...mostly highway and 70 mph.....17.4 mpg

Hand calc'd

Slim

[Duramaster]

The ECM is supposed to keep track of the last 10 program reflashes.