Mileage suddenly less

[scotticus]

2020 JTRLE, 69.8k miles. Only mods I would say I have are the RSI Smartcap and a winch. Truck is usually empty. within the last month or so, my mileage has gone down by about 2mpg, from like 18-19 (more often around 19) to 16-17 (trying to keep it closer to 17). The Smartcap was added around thanksgiving, and i noticed a slight uptick. I also got new tires, stock size and stock wheels, but the newer Falken AT4Ws which are heavier. Is the tire weight going to affect my MPG that much? Air filter was recently cleaned and the oil is at about 45%, (i do 10k intervals with synthetic). This is my first Jeep, so I'm just trying to work through the issue. Has run very well so far, no oil spots or other issues. I haven't serviced any fluids other than oil. Any suggestions?

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[dmwphoto]

Heavier tires can make significant difference

 

[Mr._Bill]

Try increasing the tire pressure a little. Probably a good time to change the fluid in the Differentials and transfer case. Talk to the dealer about a fluid and filter change for the transmission. Not a flush, just a drain and refill.

 

[scotticus]

Try increasing the tire pressure a little. Probably a good time to change the fluid in the Differentials and transfer case. Talk to the dealer about a fluid and filter change for the transmission. Not a flush, just a drain and refill.

what does that transmission fluid and filter change usually run? transfer case service?

i'm running around 39-40 psi on the low side right now.

 

[Mr._Bill]

what does that transmission fluid and filter change usually run? transfer case service?

i'm running around 39-40 psi on the low side right now.

The transmission service will vary depending on the dealer. I would guess in the $1700 range. The response from the dealer will vary, since the official Jeep line is that it doesn't need done under normal conditions.

The transfer case is probably a couple hundred, since it is just an ATF fluid drain and fill.

I have the stock street tires on mine. I run at 39 psi cold, which gives me up to 44 psi warm on the highway.

 

[JAPE]

what does that transmission fluid and filter change usually run? transfer case service?

i'm running around 39-40 psi on the low side right now.

I don't have the pricing handy but it seems I was quoted separate services for changing the transmission and both transfer cases around $1200 to $1400.
When I picked up my JT another service rep said "Oh he did this all wrong" and re-entered as a single entry covering all of the work for around $600. Lesson learned, I call for the customer friendly service rep by name, she always finds some kind of discount or reduced fee.
(I have all maintenance as scheduled with almost $110,000 miles on the odometer.) I finally did the last oil change and 5 tire rotation myself.

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