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Old 02-14-2011, 07:36 PM   #1
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Exclamation WOW! Aeroynamics really make a difference in MPG

Today I drove from San Antonio to Houston in my 2004 Wrangler with stock tires, wheels, and 3.73 gears.

For the first half of the trip I drove with the cruise on and the soft-top up. I got 18.3 mpg at a constant 67 mph. For the second half I drove with the cruise on and the soft-top down at a constant 67 mph.
Can you believe the mileage dropped to 15.4 mpg? Amazing!

I'm going to put on the safari top, windjammer, and duster to see what happens to the mileage then. I'm guessing it will improve. It'll be an interesting experiment.
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Old 02-14-2011, 08:47 PM   #2
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Doesn't matter, topless makes it worth it

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Old 02-14-2011, 08:55 PM   #3
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Doesn't matter, topless makes it worth it
This. Go topless or go home!
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Old 02-14-2011, 09:02 PM   #4
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How the hell do people get that kind of mileage?! I am lucky to pull 14mpg if I am careful, and routinely get 9-10mpg around town.
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Old 02-14-2011, 09:10 PM   #5
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It reminds me of an episode of myth busters when they tested a truck with tailgate up and tailgate down. Believe it or not the truck got better mileage with the tailgate up. With the tailgate up there was some type of cyclone like wind that swirled in the bed and increased the gas mileage.
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Old 02-14-2011, 09:17 PM   #6
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My wife and my Jeep are alot more fun with their tops off.
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Old 02-15-2011, 01:06 AM   #7
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yeah... i drive a wrangler... ive never measured my mpg... and dont plan on doing so ever.... if i am going to measure my mpg... i'm gonna start driving a prius...
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Old 02-15-2011, 01:13 AM   #8
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I checked my MPG for about a month when I first got my Jeep. I decided it's low enough, I just don't wanna know!

And I'm in the 'topless is better' crowd too. I don't care if I'm losing 10 MPG, having the top & doors off is worth it
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Old 02-15-2011, 01:33 AM   #9
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I honestly haven't noticed too much of a difference between top up and top down...doors off and doors on might be another story, but I don't do a lot of highway driving doorless. My shirt smacking my fat rolls gets annoying once the rolls go numb...lol

I haven't bothered to check my winter mileage...it sucks, that's all there is to it. But summer... usually 14-16 city, 17-19 highway.

I try to keep my RPMs low...shifting around 2100 RPM aside from speeds where I'm in 5th gear and can't shift any higher. I cruise anywhere from 70-80 on the interstate...usually no faster than 75 though. 80 starts to get a bit scary...haha
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Old 02-15-2011, 05:18 AM   #10
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yeah... i drive a wrangler... ive never measured my mpg... and dont plan on doing so ever.... if i am going to measure my mpg... i'm gonna start driving a prius...
Very well put
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Old 02-15-2011, 05:23 AM   #11
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mid 18s here in the city and around 21.5 hwy with my JK but that is gonna sink like the titanic with the new MTs going on this week.
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Old 02-15-2011, 07:24 AM   #12
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yeah... i drive a wrangler... ive never measured my mpg... and dont plan on doing so ever.... if i am going to measure my mpg... i'm gonna start driving a prius...

True... but i like to know if there's a drastic loss in MPG relating to an issue I don't know about.
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Old 02-15-2011, 07:44 AM   #13
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dstacy, you don't need to use "mileage experiments" as an excuse to drive a Jeep
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Old 02-15-2011, 08:03 AM   #14
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mine's not my DD so sometimes I might drive it 200 miles a month. That leaves a lot of time to forget the last time I filled up, so I re-set my trip odo every time I do (being stranded once on an empty tank b/c the the low fuel light failed to come on is one time too many.) That way at least I have a general idea.

once it didn't come on until 230 miles
it used to usually come on around the 190-200 mile range

then I installed my cargomaster congo rack-
now it usually comes on at the 160 mile mark
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Old 02-15-2011, 08:23 AM   #15
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Doesn't matter, topless makes it worth it
I love it when a girl says that.
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Old 02-15-2011, 09:56 AM   #16
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yeah... i drive a wrangler... ive never measured my mpg... and dont plan on doing so ever.... if i am going to measure my mpg... i'm gonna start driving a prius...
Well thats just dumb. Guess you've never had to plan out a long road trip...
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Old 02-15-2011, 09:59 AM   #17
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For road trips in the jeep its kind of like, yeah I can see the next gas station, we might just make it...
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Old 02-15-2011, 10:05 AM   #18
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I have a 97 TJ 2.5, I get about 180 miles per tank, I have 31 x 10.5 so it might be a smidge better. I do know that in towing it from Houston to Colorado, it has the aerodynamic of a large brick and kills my tow cars mpg but if I count 2 vehicles going 1100 miles on the gas in the suv alone my mileage is incredible!
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Old 02-15-2011, 10:07 AM   #19
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For road trips in the jeep I top off the tank and a couple gas cans just incase. And I go topless and doorless everyday its not raining and its warm enough to do so. Doorless on the highway takes a bit getting used to though.
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Old 02-15-2011, 10:19 AM   #20
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For road trips in the jeep its kind of like, yeah I can see the next gas station, we might just make it...
Kinda my point ...you've got to avoid those long stretches where there are no gas stations...or the gas stations that are open are only open til 8 PM and you're scheduled to pass through at 10...

And then you've got to schedule in all of those additional fuel stops you'll be making...
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Old 02-15-2011, 10:29 AM   #21
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How the hell do people get that kind of mileage?! I am lucky to pull 14mpg if I am careful, and routinely get 9-10mpg around town.
well it looks like the OP is from the south, so theres a good chance winter gas is not being used, also the jeep is said to be stock, even stock tires.

The driver also did this test at consistent speeds on the exp way. no accelerating and no braking. the jeep is also a 2004, so its engine is probably still pretty fresh.

Thats how you pull 18 out of a wrangler. But as for the gas part, i could be 110% wrong about if the southern states use winter mix or not.

even cruising on rural roads you need to hit your brakes for turns and things, everytime you do so your converting all of your beloved momentum into heat, which then means you gotta accelerate back to speed. I try to avoid brakes when possible and coast to stops, that way at least im not using much gas when coasting, makes up for a bit of that acceleration I need to start doing.
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Old 02-15-2011, 10:41 AM   #22
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Kinda my point ...you've got to avoid those long stretches where there are no gas stations...or the gas stations that are open are only open til 8 PM and you're scheduled to pass through at 10...

And then you've got to schedule in all of those additional fuel stops you'll be making...
Isn't that what extra gas cans are for?
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Old 02-15-2011, 10:43 AM   #23
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Isn't that what extra gas cans are for?
But how many extra do you need?
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Old 02-15-2011, 01:36 PM   #24
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well it looks like the OP is from the south, so theres a good chance winter gas is not being used, also the jeep is said to be stock, even stock tires.

The driver also did this test at consistent speeds on the exp way. no accelerating and no braking. the jeep is also a 2004, so its engine is probably still pretty fresh.

Exactly. It is 2004 with 17k miles on it and running properly.
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Old 02-15-2011, 01:37 PM   #25
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........<snip>.... but if I count 2 vehicles going 1100 miles on the gas in the suv alone my mileage is incredible!
too funny!
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Old 02-15-2011, 04:53 PM   #26
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I attributed my 17.3 to the 3.73 gears. Mine has a 4" lift and 33's with a hard top. How many of the people that don't care about mileage live with their mom who pays for their gas, have a different dd, or just have money to burn? If they made a Wrangler that got 30 mpg, everyone that owned one could afford for it to be their dd. I'd hit it.
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Old 02-15-2011, 06:23 PM   #27
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This has me thinking now...I put Precision Injectors into my 99 4.0 6cyl and the manufacturer states that they increase MPG, horsepower, etc... I immediately noticed the engine idle smoother, pedal response and acceleration was very noticeable, but I never checked the statement about MPG..... Great, now I am going to obsess over it and start keeping track.....Thanks alot!
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Old 02-15-2011, 06:31 PM   #28
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How the hell do people get that kind of mileage?! I am lucky to pull 14mpg if I am careful, and routinely get 9-10mpg around town.
I was getting 18 in mine. No top or doors.that's an average between highway and city.
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Old 02-15-2011, 06:39 PM   #29
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well it looks like the OP is from the south, so theres a good chance winter gas is not being used, also the jeep is said to be stock, even stock tires.

The driver also did this test at consistent speeds on the exp way. no accelerating and no braking. the jeep is also a 2004, so its engine is probably still pretty fresh.

Thats how you pull 18 out of a wrangler. But as for the gas part, i could be 110% wrong about if the southern states use winter mix or not.

even cruising on rural roads you need to hit your brakes for turns and things, everytime you do so your converting all of your beloved momentum into heat, which then means you gotta accelerate back to speed. I try to avoid brakes when possible and coast to stops, that way at least im not using much gas when coasting, makes up for a bit of that acceleration I need to start doing.
I just stick my foot in it and fill up when it's m/t.It's only money. No I don't live at home and I'm married. Mom won't by my gas.
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Old 02-15-2011, 06:41 PM   #30
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I was getting 18 in mine. No top or doors.that's an average between highway and city.
Man, if thats the average of hwy/city, then you must get like 21/22 mpg on the hwy. Thats incredible for a Wrangler! You have a V8?

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