How many gallons of petrol does a 4.0 wrangler need for full tank and how many miles or kilometers can it go?

Answer 1

Most have a 15 gallon capacity, but 20 gallon is optional. In reality, they all have a 20 gallon tank but the 15 gallon has a longer vent hose into the tank that only allows 15 gallons to be put in. But removing & clipping this longer vent hose, 20 gallons can fit into the tank, but the sender will also need to be changed to have an accurate reading. The sender is usually not available separately but the fuel pump & sender are one unit. As for milage, Wrangers are not noted for getting good milage- like pushing a brick through the air. Most get 13-15 and if lucky 16 on the road. Mine has a modified air intake & exhaust and gets 16-17 around town & I got almost 19 pulling a small fishing boat & buzzing along at 65-70. So for a Jeep with the gearing & wind resistance, that is great! Mine is also a 91 and has the OBD1 computer system. The OBD II system might not get as good, but I do not know for sure. I do know I have not found anyone lese that owns a Wrangle with a 4.0L 6 cyl that gets this good. One thing to note- many people think the 4cyl should get better milage. It gets about the same as the 6 cyl because it runs the same weight & wind resistance & gears but has to work harder. So get the 6 and a manual unless you hate stick shift. My personal want is an Unlimited Rubicon with a 6 spd manual. Then modify the intake & exhaust to breath better and some nice tires!