I am hoping to get EFIlive for my Duramax soon, and have questions about using it on my dads 2008 2500hd 6.0l.

What gains in HP and Torque can you expect from a good tune for the 6.0L?

What gains in Mileage can you expect?

Can you control the alternator output with EFIlive?

Is there anyone out there that will sell you a tune ready to be loaded?

Can you recommend anyone that creates the tunes?

Thanks for the help.