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Can you tell if a super chip has been installed when you buy a vehicle?
I purchased a 2003 Tahoe last fall and I am getting over 17 mpg on a highway where there is a small town to slow down for every 15 -20 mi and am I getting 17+ mpg is it because i cleaned the K&N filter and changed plugs and wires or is it because it has a super chip installed and how can I tell if it has been installed