HP Tuners or EFI Live
As for the learning curve these are my suggestions http://www.hptuners.com/forum/showthread.php?t=11178
Both are great products and will get the job done.
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All the points above are spot on, and the free upgrade policy is great.
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You can learn alot by reading both forums.
I am tuning my daily driver trailblazer for better fuel economy. I calculated that only a 1/2 mpg improvement will pay for the tuning software over the next 100K miles of the truck. From what I have read, it is easy to pull out 1-2 and possibly 3-4 more mpg. So that is a easy way to justify buying either package. I am still on my first tank of gas with the trailblazer, so time will tell at the fill up.







