MACHO
Full Access Member
2011tahoe, I am accepting donations of Belltech kits...FYI 
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here's a screen shot of the EXCEL math:
basically, going from 16mpg to 26mpg saves you $2500 a year:
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PM me your address, and I can send you the excel file.
Just bought a 2011 ltz with 13k miles for $45k at a Lexus dealership