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My dealer said that they have did this to a few customers trucks and have seen at least +5 mpg increase on all of the trucks and some up to +9 mpg. They don't have the programming for the my 06' truck yet so I can't verify but here is the link to the company
http://westersgarage.eidnet.org/duramax.htm
Nov 05' - 549HP and 1030ft/lbs torque with just a computer flash
http://westers_garage.eidnet.org/Index2.htm
http://westersgarage.eidnet.org/duramax.htm
Nov 05' - 549HP and 1030ft/lbs torque with just a computer flash
http://westers_garage.eidnet.org/Index2.htm