JK 3.6l fuel economy
 

What’s everyone getting for fuel economy.

Mine is sitting at 17l/100 stock, haven’t lifted or done larger tyres yet. It has the 3.73 gearing.

Is there a magic button to get better mileage?


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What sort of driving are you doing?

Jesus, my 3.8L JKU wouldn't drink that much even with all the gear I had fitted.

The only time I'd use that much was when I was towing my camper trailer.

Just standard driving, last couple of days I’ve been keeping it in the eco “between 1k-2.5k” and I got it to drop from 18.5 to 17.8.

So it is abnormal. Anyone got any ideas at what to look at?

I used JScan app and confirmed hearing and tyre ratios are correct. Also confirmed no errors.


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Seems high for a 3.6. My 4L inline TJ got around that, and the 3.8JK gets around 15km/L with just local driving here in the Mountains. (With the extra gear on it.) Lower when sitting on 100 on the motorway, or longer trips that aren't stop/start.

I had a 14 Rubicon on a big lift with 35s, roof rack, bullbar, sliders and a heavy ass Kaymar rear bar on it and it did around 17 litres per 100km with me caining it everywhere. I would expect a stock one to do better than that.
Put a couple of tanks of 98 (with no ethanol) through it and drive it aggressively everywhere (plenty of trips to the redline). Make sure your tyres have plenty of pressure in them, make sure the air filter isn't super dirty and if its auto make sure the torque converter lock up is functioning properly. After all that go back to normal fuel (no ethanol) you should be able to get at least 13-14 litres per 100 around town and 11ish on the highway.

Has your fuel economy always been that high? Do you do a lot of city driving or in slow traffic?

My modded 3.6 JKU sport gets around 14L/100km daily based on the dash readout, 15-16L/100km when towing and usually around 18L/100km off-road or on the beach.