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A cold engine is unavoidable. Given stock equipment, there is always a penalty which is right at 45-miles at 45-mph or better. All fluids and grease must come to their specified operating temperature BEFORE heat burns off condensation and acids formed. It takes close to 90-minutes on a 70F day before tire temperatures stabilize. Thats where warm-up ends.
A short trip is ANYTHING less than this.
FE is, in one sense, cutting cold starts to a dead minimum.
Coolant temp is only one step. Oil temp is more important for “reading” the warm-up process.
I had several XJs. Great motor architecture in the 4.0L. Literally the reason Chrysler bought Jeep.
Temp control is not the vehicles strong suit. Asking a straight-six to work under a load means airflow. Once all that mass heats up, it isn’t shed easily.
Be glad it’s EFI. That’s 90% of the battle.
Straight axle vehicles are plagued by bad steering & handling. Can’t push it like a rice-burner. So, don’t. New HD shocks & tight front end are important.
Tires & brakes should last 70k given best quality parts.
Tires themselves are where savings occur: closed shoulder highway rib
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