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What year ML and wear year GC?
That will make a big difference.
I've never had the chance to reach the same mileage with the 2004 Jeep, probably because of the nice summer tires I had on the 2002, the allseasons on the 2004 might bring some fuel consumption penalty.
Recently I've experimented with fuel pressure increase in the engine tune and my recent tank showed some improvement:
Average fuel consumption over 55.000km is 10.267L/100km (22.91 mpg), and with the recent update I used an entire tank of fuel in varied conditions, including offroading in low range, city driving and managed 9.66L/100km (24.31 mpg).
The fuel pressure increase should help fuel atomization, decrease injection time and slightly advance timing, all should help fuel consumption.
Another update since the last activity was tuning the transmission control unit to lock the torque converter earlier, at 57km/h instead of 70km/h from the factory. This allows me to drive with the converter locked when passing through small towns on national roads, bringing some small improvement in fuel consumption.
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