gas mileage 65 vs 70

[Maine 4 ME]

I've done a DC to NH round trip four times, each time averaging 24mpg or higher except one time the return trip was really windy and I only got 21. All of those times I was driving 80mph whenever possible.

My experience has been similar. I drive like Gramps and am currently at 23mpg for 1100 miles. I rarely go over 65 and don't speed on the side roads. I also take it slow out of the blocks at lights and let the youngins do their thing (speeding and shaking their heads in self righteous indignation as they pass me).

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[LLANERO]

No surprise there. Drag increases exponentially with speed, and considering the Wrangler has the aerodynamics of a brick on wheels . . .

What he said. Mine varies more than 5 mpg on the same road at the same speed depending on wind conditions

 

[allieboy]

I've done a DC to NH round trip four times, each time averaging 24mpg or higher except one time the return trip was really windy and I only got 21. All of those times I was driving 80mph whenever possible.

Did you use the dash info or calculate ACTUAL miles/gallons? Seems very high.

 

[viper88]

so I was doing some highway driving yesterday in my rubicon stock wheels on I 95, set cruise to 70 mph and checked the mpg via the computer, it was a bit breezy but I managed a steady 22 mpg over about 10 miles. I decreased my speed to 65 mph and reset the mpgs and the computer displayed 25 to 27 mpg over the next 10 miles. I was really surprised to see the mileage increase from a 5 mph decrease. I need to try this on a longer drive to see if I get the same results. Anyone else getting this mileage from slower highway speeds?

Which engine?

 

[viper88]

I did a 650 mile round trip, a couple of weeks ago, with lots of rain and wind. . I set mine at 70 mph, and hand calculated my mpg at 24.5 mpg. The computer said 24.7 mpg. I was pretty loaded down, with the family, and luggage. Then again, i have a JLU Sport S. Auto.

3.6 or 2.0 engine?

 

[Jo's Jeep]

Going From San Diego to Phoenix, I was able to register 55MPG in my '08 Challenger SRT 6.1L while driving down into the Imperial Valley. Point being you will get wildly varying results due to ever-changing environmental conditions.

 

[Jeepsmashin]

I've been trying to drive slower to get bigger mpg, so far im averaging 22 mpg, I know it would be better if my drives were longer on the highway, I'm guessing I could get 24 mpg. This is with a stock JLUR

 

[mazeppa]

The way I drive, getting about 17-19 mpg highway on my stock drivetrain JLUR, my JKUL got about 14-16 mpg.

 

[Nomad]

Did you use the dash info or calculate ACTUAL miles/gallons? Seems very high.

That was the dash readout.

 

[Paluss]

Which engine?

v6

 

[roaniecowpony]

Aero laws of physics dictate that to double the speed, you need 4 times the power. Think about that effect on fuel consumption going from 35 mph to 70 mph. But then, I didn't buy a Jeep because they were economical. Mine isn't getting 20 mpg. Probably more like 16. I don't care. I would have bought a Prius if I cared...and I hate Priusususus.

 

[Eloib]

Aerodynamics affect all cars. Aero drag is proportional to 1/2 of the density times the square of the velocity (in standard units, aka m/s). The aero drag at 70 mph is 15% higher than at 65 mph. Your consumption jump to 25 mpg is what is expected.

 

[DaltonGang]

3.6 or 2.0 engine?

3.6

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