Received this product just in time for a very long 2000+ mile ride in my 2013 Avalanche. The immediate return of power to the vehicle was immediately noticeable. No more "lag" response from V4 mode (which got so bad I thought I was going to lose transmission). After replacing and upgrading the spark plugs, wires and even all the O2 sensors I took the chance to look at a lot of reviews and videos and it finally woke up the 5.3 I was used to from previous trucks. Best OVERALL fuel economy so far in my owning and I usually drive at or slightly above street speed. There were times when I drove very slowly without getting 19.5/20mpg. Going from IN to FL (lots of high speeds) I managed an OVERALL average of 18-19.5mpg and that was with traffic jams, occasional stops and everything else. Super easy installation in seconds. plug and play Adds a cool little "mood light" when you're driving. I left the truck in the parking lot without driving for 3 days and had no battery drain issues. I hope this helps someone make a decision and love their ride again.
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