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Unread 07-28-2010, 12:14 PM   #1
Maverickxeo
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Fuel economy with different tops

I did some testing and found that on the highway, that if I have the Jeep roofless, it gets almost identical fuel economy compared to if the hard top was on. I am also in the process of testing to see if the soft top/bikini tops vary as well. (From what Ive seen, the bikini top I have DOES decrease fuel economy; and the soft top is slightly less than the hard top/roofless).

I drive 50km to work each day, and I keep a constant speed of around 120km/hour. Im sure at different speeds the fuel economy would change, but I just felt like spreading this information (although Im sure most of you knew this already).

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Unread 07-28-2010, 01:35 PM   #2
blubaru2002
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I took the doors and windows off but left the softtop on and my mpg dropped to 12.85. I usually get over 14.50 mpg.
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Unread 07-28-2010, 02:34 PM   #3
bige2533
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I would see a very slight increase in mpg during the summers in which I would take my hardtop off. I think taking it off made it more "aerodynamic" because I get a lot of wind noise from the top of my windshield with the hardtop on. That plus the reduced weight is my guess.
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Unread 07-28-2010, 02:36 PM   #4
little_Jeep
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No one buys a Jeep because they like its MPG...
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Unread 07-28-2010, 02:37 PM   #5
Maverickxeo
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Originally Posted by little_Jeep View Post
No one buys a Jeep because they like its MPG...
Of course, but it still is interesting to know isnt it?
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Unread 07-28-2010, 03:00 PM   #6
Zeep
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I have my top up, but no doors or windows, and already have 75 miles on just a quarter of a tank!!!!
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Unread 07-28-2010, 03:13 PM   #7
blubaru2002
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Quote:
Originally Posted by Zeep View Post
I have my top up, but no doors or windows, and already have 75 miles on just a quarter of a tank!!!!
And what size tires are you running again?

Also jeep gas gauges are notoriously inaccurate.
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Unread 07-28-2010, 03:45 PM   #8
Maverickxeo
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Quote:
Originally Posted by blubaru2002 View Post
And what size tires are you running again?

Also jeep gas gauges are notoriously inaccurate.
Yeah, Ive never relied on the gauge... I just fill up at one quarter left.
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Unread 07-28-2010, 04:38 PM   #9
gratefuljeep
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Quote:
Originally Posted by Maverickxeo View Post
Yeah, Ive never relied on the gauge... I just fill up at one quarter left.
with a quarter tank on my gauge i still have 8.5 gallons left to use.
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Unread 07-28-2010, 07:08 PM   #10
Zeep
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Quote:
Originally Posted by blubaru2002 View Post
And what size tires are you running again?

Also jeep gas gauges are notoriously inaccurate.
I'm just say'n, at a quarter tank, 50 miles on the trip meter, is usually the norm.
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Unread 07-29-2010, 12:03 AM   #11
RogueSpear2023
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Your driving a vehicle with the aerodynamics quality's of a piece of ply wood, anything can cause mileage differences, unless you are pulling a sail, I can't imagine there are going to be huge differences, that can really be related to tops.
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Unread 07-29-2010, 05:24 AM   #12
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Quote:
Originally Posted by bige2533 View Post
I would see a very slight increase in mpg during the summers in which I would take my hardtop off. I think taking it off made it more "aerodynamic" because I get a lot of wind noise from the top of my windshield with the hardtop on. That plus the reduced weight is my guess.
All of my vehicles get slightly better gas mileage in the summer vs. the winter.
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Unread 07-29-2010, 08:29 AM   #13
jay-h
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As others have noted I get better gas mileage (all our cars) in summer than in winter (different formula?)

Surprisingly to me, the soft top up does a bit better than hardtop or no top.
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Unread 07-29-2010, 10:10 AM   #14
93iroZJ
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how do you guys get such accurate readings of your MPG..

for example:

I took the doors and windows off but left the softtop on and my mpg dropped to 12.85. I usually get over 14.50 mpg.

how do you figure 12.85....
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Unread 07-29-2010, 11:12 AM   #15
Roadyy
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next time you fill the tank up reset your trip meter. Then when you go to fill up the next time you divide the mileage by the gallons of gas it took to fill it back up. That gives you your mpg.
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