Since the invisible needles force me to keep the EVIC on MPH and I do not want to keep my laptop on the OBD-11 port allatime, I just found a very interesting gadget from Chrysler Parts, an Ecometer.
Now back in the day these were just a vaccuum gauge and while driving on IMAP reading is possible, it is not interesting.
This thingie plugs into the OBD port and according to the literature:
• The Ecometer reads current fuel economy, average fuel economy, RPM, and vehicle speed (looks like choice of one but may flip)
• The red, amber, and green lights indicate how well you are doing at keeping the vehicle in the most fuel efficient driving mode
p/n 8ECO9000 says "This fits your 2011 JEEP GRAND CHEROKEE" & installs in 24 minutes.
My only question is where does it mount ? Visible space is at a premium.