tuners
TWWWW
07-03-2014, 01:26 AM
What is the best tuner for a 2007 suburban ltz 4x4 5.3ltr? I am getting 13.5@70mph highway and 10mpg in the city. averaging 12mpg. I can't find anything on what increase i will get with all the different tuners out there. any suggestions?:confused:
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