The 2023 Jeep Gladiator Overland diesel is not as quick as its gas-powered counterpart. You can’t get it with the manual transmission or full-time transfer case. The diesel model also weighs an extra 500 pounds and its maximum tow rating is lower than that of a gas-powered Sport S Max Tow. The Italian-built 3.0-liter diesel V-6 is louder than the 3.6-liter gas engine, both at idle and at 70 mph. It also adds a total of $4650 to the sticker price and requires fuel that, as of this writing, costs an extra $1.38 per gallon, on average. Oh, and there’s diesel exhaust fluid to think about because running out of…