I cannot believe that you guy's are averaging 17-18mpg highway. I tried driving normal so many times to try and best the mpg but no way. I may buy the Edge Ensight CTS to see how if I can improve my mileage with it.
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Keep in mind that the Ensight CTS is a monitor only, it doesn't tune at all. You CAN use it to read codes and monitor things as you are driving but that is it. I had it on my Dmax and wanted to keep up with things on the Yukon, but the Dmax is tuned with EFILive. On the "wish list" for the Yukon is a Ensight CTS and the back up camera that you can get with it.
I got mine at the link below. $399 shipped. Yeah it is easy to get mileage figures all out of whack when talking about so many different versions of vehicles. It is actually kind of amazing, my Duramax gets just under 26 on the highway "hand calculated" running the same speeds; makes me want to save my pennies and do an LB7 swap into the Yukon...lol
http://www.syntheticmotorsports.org...t&productid=57&prodn=Edge Insight CTS - 83830
...many would be shocked if they did it this way. JMHO
A scangauge II costs $150 and works just as well