I'm curious what you see fuel consumption wise when towing. I'm mostly interested in insight from the 3.2L TH owners, but feel free to comment for others that may search out or be interested.
I have never been satisfied with our KLs economic performance, but this weekend was our first time out with it while pulling our ~1600lb overland trailer. I averaged 10.1 MPG on a largely interstate trip where my speed was kept between 70-72 MPH. It seemed our little KL just didn't have enough grunt and spent large amounts of time in 4th and 5th gear (3000-4000 RPM). I know our trailer is by no means aerodynamic, but this is absolutely absurd. We purchased our KL TH to be a forestry road light overlanding rig, but with a 200 mile range there is no way I can use it for this.
On the way home I did everything I could get the best fuel economy; no cruise control, easy on hills, lots of coasting... Still I only improved the return trip's economy to 12.8 MPG.
If this is what I can expect on fuel usage I fear both Jeep and we made an EPIC mistake on vehicle selection.
My boat and trailer weigh in at about the same as your trailer. With 20 gallons of gas a bit more.
I will average about 19 mpg keeping it at or under 65 mph. Anything over that the mpg crashes. That is normal even without towing.
I will average consistently 29-32 highway without towing. So you can see that is still a 10-13 mpg drop.
Now the over 65, actually 62 mph the mpg will drop regardless.
Now I am in 8th without towing on the highway. That is 8th from 57mph and up.Towing I am in 7th and 6th depending on conditions.
I know just being in 7th even without towing will cost you mpg.
The RPM at 3-4000 seems high but at 70mph in 4th or 5th that seems correct. I would question the gearing working correctly.
Mine seems to adjust the gears in order to keep the rpm at around 2500. Thats the sweet spot. The 3.2 has more than enough power to handle that under 2000lb tow.
That 3.2 is no wimp in towing. I came from a V8 Grand Cherokee tow and there is not much difference being under 2,000lbs.
Improve mpg while towing. (1) Tire pressure should be adjusted to towing weight. If you hook up to your normal psi then you might actually be under inflated. I usually run mine at 36-37psi.
Your tires will run cooler under load and offer less resistance to the road. The faster you go the hotter those tires will get, especially the trailer tires if they are underinflated.
(2) Use the speed control it does help in my opinion. That is all I use on the highway. I have ACC cruise.
(3) The big one: Speed. Try it at or under 65. That is the biggest improvement you can make.
My State limits trailers to 55 mph. The next state over its the speed limit, generally 65 which is generally 2/3 of my trip to go fishing. I still keep it under 65 as possible.
Also you may want to reconsider your actual total weight. That is cargo in the trailer + anything loaded in the vehicle. It adds up fast and impacts mpg.
One of the reasons I gas up by the lakes so as not to haul an extra 10-15 gallons of gas along in a 21 gallon tank.
Also if you are dealing with mountains/lots of hills thats a mpg hit.
My Cherokee is a 3.2 Limited with AD2.