Suffer poor MPG???

[azjl#3]

I just find it interesting I can get 21mpg in the mountains at 6000ft, but at 400ft in Dallas driving the freewey perfectly level, I get 17.

Sponsored

 

[J.Ferreira]

I took the doors and windows off the Jeep and dropped about 2 miles per gallon

Worth it though. I'm in Colorado with a manual though, so I have no horse in this particular race.

 

[roaniecowpony]

I just find it interesting I can get 21mpg in the mountains at 6000ft, but at 400ft in Dallas driving the freewey perfectly level, I get 17.

It's not all that odd. You are power limited at 6000 ft and the PCM compensates for mixture. Lower power=lower fuel burn (with good EFI).

 

[azjl#3]

It's not all that odd. You are power limited at 6000 ft and the PCM compensates for mixture. Lower power=lower fuel burn (with good EFI).

and therefore less air resistance for the brick

The counter is on i40, I was getting 12 mpg doing 70, level no climb but running about 5000 elevation.

 

[roaniecowpony]

and therefore less air resistance for the brick

The counter is on i40, I was getting 12 mpg doing 70, level no climb but running about 5000 elevation.

When I had airplanes, best cruise economy was often at around 7-10K ft where the naturally aspirated engine's remaining power and reduction in the aircraft drag seemed to compliment each other.

Flying some turbocharged planes always had best economy at much higher altitiude.

 

[KCSgtMaj]

Is this the MPG thread?

 

[roaniecowpony]

Is this the MPG thread?

Nah, just another ol regular forum thread about everything.

 

[wibornz]

If I read all five pages, will I get better mileage? I run 37x12.5r17 tires. either Cooper STT PRO and now Mickey Thompson Baja Boss AT. I see mileage like this as a high

Usually about 17.8 to 18.1 on the hyw with just the Jeep not loaded down with gear, and 16 around town.

If I tow my camper, I average between 12.5 to 14.1 depending on the terrain and wind conditions. Wind and terrain has caused my mileage to drop as low at 9 mpg towing the camper.

I ran 40x13.5r17 Cooper STT PROs for a little bit. I got 16 on the HWY and averaged 8 mpg on flat roads on the hyw. I took them off as 8 mpg towing the camper was the best I got. Out west in the mountains, it would probably be closer to 5 mpg. This does not give me sufficient range out west to get from one gas station to the next. So the 40s go sold.

 

[Ratbert]

and therefore less air resistance for the brick

The counter is on i40, I was getting 12 mpg doing 70, level no climb but running about 5000 elevation.

Humidity plays a role as well. We're at 7.6k feet with incredibly low humidity and rarely drop as low as 5k feet.

 

[Old Jeeper]

If they neglected to do that then that could explain your transmission shifting issues. The simplest way to verify that they did it is to compare what a GPS-based app says your speed is versus the speedo. If they didn't adjust it your speedo will say that you're going slower than you really are.

Good advice on that, will check out, thank you!

 

[thorntonjr]

I can get my MPG a lot higher in the city than on the highway as well.. but I attribute that to my heavy wheel and tires.. they don't allow me to see 8th gear for sure.. 7th rarely.. if I'm cruising in the city at a steady 30 to 40mph.. I can get over 20mpg.. highway not so much..

Sponsored