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With heavier Hurricane (F53 chassis) and same V10 - I typically leave it on cruise on the interstates... I definitely see a difference in downshifting uphill when the 3500 lb Jeep is along for the ride - but still maintains speed.
I do use tow/haul when towing the Jeep - and it does a good job of engine braking on the downhills to keep to set speed.
The engine does wind up over 4700 at times.. and my new toy (OBD2 wireless adapter and Torque Lite Android app) shows the instantaneous gas mileage dip below 3mpg... but we just made Michigan to Florida in 2 days driving...
Never seen the engine or transmission temp gauge even budge off normal...
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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