MPG Check

[reprod89]

I decided to check out the mpg out on liltte old red my 89 manche ( 2,5L 4 speed manual 2wd) to see what my average is with no mods done to it( besides minor things oli change, air filter, brakes)

the basic maint. I am useing is  (mileage at next fill up - the milageat full tank /how much i filled up at this refill) and all are dated to see the deration between fillups.

1. 06/'28/14 mile 117624.9 (let the games begin)

 

2. 07/05/14 CM 117746.6 gallons of gas 6.266

                        -117624.9

                              =121.7 /6.266= 19.4 mpg

 

3.07/08/14 Current Miles 117931.4  gas 8.725 GL

                                        -117746.6

                                         =184.8 /8.725=21.18 mpg

 

4.07/15/14 CM 118131.1 gas 10.216 gl

                        -117931.4

                            =199.7/10.216= 19.55 mpg

 

5. 7/21/14 cm 118310.0 gas 8.760

                      -118131.1

                          =178.9/8.760=20.4 mpg

 

6. 7/28/14 CM 118478,4 gas 9.496

                       -118310.0

                           =168.4/9.496= 17.73 MPG (ouch)

 

7.08/06/14 cm 118636.0 gas 8.462

                       -118478.4

                            =157.6/8.462=18.62mpg

  not bad for a 25 year old jeep for a one month test run . :MJ 1: .

red is still trucking along till she dies or find one to replace my DD.

 so ask your self hows your mpg stack up?

[AMCJeepMJ]

It's easy to track your mpg using fuelly.com; I have used the site since late 2011 and a few others here do too.

 

Below is copied directly from http://comancheclub.com/topic/44096-gas-mileage/ just this past week for my 87 2wd 2.5 MJ:

 

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http://www.fuelly.com/car/jeep/comanche/1987/Oceanic815/102921

 

Above is my Fuelly tracking for my daily driver: average of my last 5 tanks as stated is 24.0 mpg, with a best tank of 24.8; however, I run 245/70/16s that are 4.6% larger than stock to result in a 25.1 mpg average for my last 5 tanks and 25.94 mpg for my best tank.

 

What have I done to achieve this? Thanks for asking. ;)

 

• Light on the gas pedal, shift early (I'm in 4th by 25mph)
• Maximum speed of 55mph (I can get away with this in Oregon without getting flipped off or cut-off much)
• Start coasting a long way back from a stop
• Over-sized tires aired to sidewall maximum suggested pressure
• Empty bed, no canopy or tonneau cover, tailgate up
• Antenna and bumper lights removed
• Homebrew air dam and grille blocks:

 

The air dam, which was taken from a mid-80s S-10 pickup and mildly resized, is riveted to the stock chin that runs between the fender flares. It is then gorilla-taped to the underside of the bumper in order to seal it. I run angle iron to brace the dam to prevent it from folding back at highway speed. The dam could stand to be another 2" lower and extended to the sides to cover some of the frontal area of the tires... but that's a project for another day.

 

Our rigs have poor aerodynamics, mostly due to the fender flares and coarse underside- it is easy to improve fuel mileage over the EPA estimates with only a little work.