Just an FYI, the radiator cap is what determines cooling system pressure, not the coolant itself.
$43 a gallon? No thanks, that's a lot of money to piss away if a radiator starts to leak or a hose blows.
A good coolant upgrade is stepping up to the newer Mopar HOAT or Zerex G-05. You get better protection for your aluminum components (radiator, water pump, aftermarket heater cores) and a longer service life for only about $4 more per gallon.
Not to mention I've noticed a 10* reduction in operating temps vs regular green, which I've confirmed via scan tool.
His: '00 WJ 4.7 Limited- stock
Hers: '03 WJ 4.7 V8- IRO 3", 245/75/16 Duratracs