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Old 05-15-2013, 05:51 PM   #1
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gas mileage analysis

so I learned how to apply filters finally to my gas mileage app and here is what I have found:

----------avg mpg---- fill-ups:------- decrease from stock:
before lift:--17.9------32 (21 mpg record, several 20's)
after lift:---15.7------34------------13%
hard top:---15.6------27------------13%
soft top:---16.1------4--------------10%
no top:-----16.2------3--------------9%

Now, the data on soft top and no top isn't very much so I can't say anything about it's accuracy, but before lift, after lift and hard top should be pretty spot on with that many fill ups.
Another thing of note that I just thought of, I was commuting pretty heavily (40mi/day+300mi trips 2/mo) last summer when it was stock, so here is that data in stock form:

commuting: 18.0 over 29
back at school: 17.4 over 3

which would make after lift about 10% decrease over stock. Before lift data was also about half/half of hard top/no top, but I don't have that information.

Another thing that should be mentioned, before lift, soft top, and no top were all in good weather months, while hard top was essentially all winter months, so hard top might be a little higher?

Interesting stuff.

For reference information:
mileage was conducted as gallons input, mileage output (odometer and confirmed by GPS)
2004 wrangler sport- 4.0L 5-speed manual. Dana 30 front, 44 rear 3.73 gears
stock: 30" A/T tires
not-so-stock: 4" suspension lift, 33" BFG KM2


This is NOT posted to say
"can i get better?"
"why is it 'so bad'?"
"This is what you should be getting"
or anything of the sort
I am simply a data analysis junky in my spare time and thought others would find it interesting.

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Old 05-15-2013, 06:04 PM   #2
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Nice work but personally I could give a crap what my mpg is once I know what my average is after the first few thousand miles of caculations. When the light comes on I get it filled. In NJ they pump our gas (like Oregon) so I get "it" filled vs filling it up. LOL

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Old 05-15-2013, 06:43 PM   #3
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haha yea, thats why I added the " not a 'help me!' or 'this is what you should get'"
bit.
Whether I get 12 or 20, doesn't bother me, I will still drive it.
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Old 05-15-2013, 10:16 PM   #4
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Quote:
Originally Posted by Atthehop View Post
Nice work but personally I could give a crap what my mpg is once I know what my average is after the first few thousand miles of caculations. When the light comes on I get it filled. In NJ they pump our gas (like Oregon) so I get "it" filled vs filling it up. LOL
Either NJ is hurting for jobs or people there are extremely lazy...either way i'm glad I don't live there. How much do they tack on to the gas prices to pay for that labor?

I would like to have your vehicle inspections here though. There's cars on the road here that can barely pass smog let alone a full safety inspection.
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Old 05-15-2013, 10:54 PM   #5
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Having grown up in Oregon, im used to it, but definitely enjoy going to washington/idaho (not cali... gas prices too high) and being able to pull up with no lines and get in/get out without waiting. oregonians have so many excuses for why they dont want self serve... like my 'business suit will get dirty/smelly' 'i am above doing that kind of job' etc etc. I agree: just lazy people who don't know the benfits.
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Old 05-16-2013, 07:31 AM   #6
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I get anywhere between 17.5 and 18.5 around town driving on my '99 hard top TJ manual tranny. I don't know why I check it other than to keep tabs on whether or not I might need to do a tune up. I can't imagine getting better with the top off. Mine has 31 inch tires, otherwise stock.
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Old 05-16-2013, 08:58 AM   #7
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Went 308 miles with a 1/4 tank left when I stopped for gas last night. I would have gone ahead and ran the rest out but was taking a little drive and didnt want to worry about finding a station. I usually go about 325-350 miles on a tank. Have gotten more out of it also got less a couple times. Like mentioned already I would still drive it everyday if I was only getting 10mpg.
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Old 05-16-2013, 02:29 PM   #8
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whew that is a lot of miles! haha even at 16mpg, my empty light comes on at 200-210. Although ive gone 20 miles on empty and still only only put in 14.3 gal (leaving 4.7 in a 19 gal tank).

I definitely would like to explore more data on soft top and no top, but I agree, I would think hard top would provide best mileage due to shape and aerodynamics, and polar, no top creates a aerodynamic cavity, but the only thing I can think of is the aerodynamics are already in the toilet, so the decreased weight of the hard top/soft top plays more of an effect.

But that brings up another good point, checking mileage is not simply for curiousity, but is often a good indicator of functioning problems.

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