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Also the 2.8 isn't known for mileage and makes just a hair more power than the 4 cylinder. Skinnier tires will also get better mileage. On top of that, good quality street tires will get better than the off brands, and any street (AT) tire will get better than offroad (MT) tires.

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Watching this one close and taking notes.

 

It's too damn cold out to be working on anything that does not absouletly need it, not to mention the snowpocalypse they are predicting for this week. On the other hand I am only getting about 12 Mpg on my 2wd / 4.0 Eliminator. I am planning on going through an working on that in the spring (along with everything esle that gets put off all winter)

 

Good info here on some things to start with.

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When my first 87 MJ was still stock, it would cruise 60mph on 235/75R15 tires (one size larger than the stock size on that truck) at 24mpg on flat ground. That was a 4.0 with an automatic transmission.

 

My new 87 MJ (2.5l 4 speed stick) I have only had for 15 hours, so no numbers yet.

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My 88 2.5, 3.55 gears and AX4 can get about ~18-20 in town and ~26 under ideal conditons. If I jump on I25 and try to stay up with the traffic moving 75-80 my mileage will drop to 16. At this high altitude 75-80 is pretty much full throttle, it reminds me of driving my 72 VW Bug.

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Might wanna think about replacing the O2 sensor too. My 91 4.0L AX15 4wd was getting 19 city 23 highway and then my O2 sensor snapped in half (no idea how that happened, it was just hanging one day) and my fuel economy dropped down to around 11-15mpg. O2 sensors technically have a life of 75-125k miles depending on the manufacturer's recommendations. Not sure how much they effect the Renix motors, I've never had a Renix.

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