I bought one for the other stuff, for example my vehicle doesn't have a stock trans temp. gauge and I use the vehicle brutally, in Arizona (yes, I have an aftermarket cooler fitted) - as well I enjoy the benefit of being able to check SES light codes, clear them if necessary, and use the assorted gauges to diagnose problems which periodically arise on an aging vehicle.
TBH I hardly use the MPG features.. I drive how I drive and haven't felt the need to correct my habits - I get ~20mpg in a lifted conventional 4x4 on all terrain tires, what more should I expect?
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