That’s great and all but why such small tires for a 4” lift?

Who doesn't like 21 mpg? I get the same tread pattern as a bigger tire but it's about 15 pounds lighter, and I have 0 rubbing with max articulation, which is a lot for LX coils. Yeah they may not fill out the wheel wells as much, but I'll trade the looks of that for the mpgs and suspension articulation.

Maybe I can post a Pic later

I believe it's possible. I got 23.1 mpg last spring in a rented '01 Taco ext. cab V6/AT travelling from Grand Junction CO to Moab UT. I used the cruise at times, and was travelling between 65 and 75mph. Speed limit in UT is 80mph, but I felt bad pushing that poor Taco up those grades at that speed.

When I filled up right before getting back to our rental house in Moab I was quite impressed when I did the calculations.

Also, weather conditions can help. Perhaps there was a tailwind, and maybe the OP drafts behind semis. Or maybe he was in some dense traffic. One time I was coming back from CT on 95 in my 97 Grand Cherokee 4 liter, and I was getting about 24mpg at 70. I think it was because I was in some dense, but quickly moving traffic. I think all the other cars helped with the aero.

Anyway, even for you guys getting 17-20mpg, it's not any worse than what the new ones are getting.

I saw that, thanks. Not sure I'd be convinced by a 20 mile drive, but it's obviously better than mine. In fact, everyone's appears to be better than mine.

To be clear, my truck is not neglected in the least, every single fluid has less than 1000 miles on it, as do plugs and wires.

Speed does indeed make a difference, though even at 67 I'm looking at 18 mpg. Here are screenshots at various speeds, I had the cruise on and drove at least 10 miles at each speed on level ground. And I did confirm the accuracy, as I filled the tank after 200 miles and was within 0.2 mpg of the gauge reading.

I am beginning to wonder about the MAF, that's the only thing I can think of.



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That's one of the best tires there is more gas mileage. I have them too.

Amalik, your coolant is at 211, mine's at 188. Could that be part of my issue?

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Oh, I'm guessing you were stopped, so that's probably soakback temp.

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My thermostat is really old, from God knows when, it needs to probably be replaced and is likely not at the right jiggle valve position. And yes, I was stopped.

I'm completely confused, or else my truck is bipolar. I just got 25.3 mpg over the last 40 miles of combined freeway and stop and go traffic, how is that possible???



To review my trip over the past few days (and why I think my truck is bipolar):

- First 100 miles = 15.3 mpg (mostly 70 mph), which obviously I wasn't happy with (this was measured by miles driven / gal to fill, realizing that there's always some error in when the pump stops).

- Next 225 miles = 17.5 mpg (about half freeway at 70 mph, half back roads with stop lights, about 60 mph)

- Next 160 miles = 17.5 mpg (all at 75 mph, cruise set).

This is when I read this thread and decided to use Torque Pro to pay closer attention (until then I thought this was normal for our trucks).

- Next 160 miles = 16 mpg according to Torque Pro (at 77 mph, no idea why it dropped from 17.5 two days earlier). I also confirmed the Torque Pro reading by calculating miles driven/gal to fill - same result.

Then I drove at different speeds for about 10 miles at a time, with the cruise set, to see how it affects mpg:

- 68 mph = 18.3 mpg
- 73 mph = 16.6 mpg
- 76 mph = 16.9 mpg.

A bit odd that 76 mph gave better mpg than 73 mph, but I may be splitting hairs.

Next is where it gets interesting. I made a stop of an hour, then headed home. I was in traffic, going about 60, and noticed that Torque Pro was reading about 24 mpg. That sort of made sense, I figured slower speed = better mpg. Then traffic sped up, and at 65 mph I was still showing 24 mpg. We sped up to 75, same reading.

By the time I got home, I put on 40 miles of about 1/3 60-65 mph, 1/3 70-75 mph, and 1/3 stop and go traffic.

And this averaged out to the 25.3 mpg you saw above. How is that possible? How can combined freeway and stop and go traffic be better than freeway only?

The one thing no one talks about is elevation. It plays a HUGE impact on mileage. When I was living in Grand Lake,CO at 9k and driving to hike peaks I almost always got over 20mpg. My power was shit and it felt like a turd but mileage was good.

Now im below sea level and I get 17-18mpg driving 65mpg. I thought something happened until I drove to utah and mileage jumped back up.


The more air oxygen the more fuel used to achieve the proper mixture.... The less oxygen( higher elevation) the less fuel used.


And everyone know those inflated numbers 24mpg+ are either not real or you worked really hard to get those and it was prob flat or down hill.

Well I'm happy where this thread has gone for the most part. If it helps I've been driving in Texas on some decently flat roads with 33 psi in the tires. Truck rides straight and true after the alignment. My toe in was .33 on the old tires before the alignment : ( now it is. 03 on each side

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So no one wants to take a crack at my crazy results?

Yes, they are crazy.

The part that's not crazy is that the mpg readings were confirmed with gallons needed to fill.

So aside from planning to clean the MAF today, I'm scratching my head as to what could cause the same vehicle to go from 16-17 at highway speeds to 25 mpg combined highway/city in the same day? The only difference I could think of was that the air temp went from around 50F to around 80F.

I also have the distinct impression (confirmed by the mpg readings) that the change occurs from trip to trip, and is consistent on a given trip. i.e. the mpg is either good or bad for the duration of each trip.

Can something be "sticking" if you will, so that on some drives it causes the mpg to be higher than on others? I'm thinking back to carburetor equipped cars, but can't really think of any equivalent on fuel injection.

When it isn't 20 degrees outside I will regularly get 23mpg on my rural 2 lane 32 miles each way to work. None of its is flat. I'm going up a hill or down a hill or dodging a horse and buggy or stopping at one of the 15 red lights on my way to work. But highway at 70mph is 19-21mpg.


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