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Old 07-15-2012, 06:05 PM   #1 (permalink)
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Cool What's your MPG?

Hey! Thought I'd start a thread about a subject I'm very curious about. It will help me determine what lift/tires I end up with. Please post your lit / tire setup and what kind of MPG you are seeing highway, in-town, and mixed. Maybe a picture to keep it interesting

Just in case you don't know how:
http://www.wikihow.com/Calculate-Your-Car's-Fuel-Efficiency-(MPG)

Me first:

1987 Samurai stock suspension and 255/70r15 highway tires Seeing 25 MPG highway.


Let's see those numbers!
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Last edited by Wantabe; 07-15-2012 at 06:09 PM.
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Old 07-16-2012, 11:40 PM   #2 (permalink)
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Same here on pavement. Better at 40mph on the back country roads. Same off road on the trail in lo range 1st or 2nd.
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Old 07-17-2012, 12:09 AM   #3 (permalink)
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1987 Samurai stock suspension and 255/70r15 highway tires Seeing 25 MPG highway...... that sucks..... i got stock everything i get 30 or more in the city 40 or more on the highway.still havent install k&n stock filter or high performance coil annd some alloy wheels im waiting on some money. 87 convertible sammy.35 psi air pressure in tires new o2 sensor,tweaked air fuel mixture screw on stock carb. full tune up replaced all vaccum hoses.oh and i wanna put a pacesetter header and a msd ignition box too.and a g.m. alternator so i can run a electric fan and a better stereo and fog lights.
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Old 07-17-2012, 06:59 PM   #4 (permalink)
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Haha so I'm a bit crazy, I reset my trip counter and fill up my tank every time. I do the math every time I get gas to calculate my mpg to 2 decimals. I see from 25.5 mpg, up to 26.6 consistently. Depending on how much traffic I sit in that week etc... from a 93, fuel injected 1.3. All stock less for the 225/70/15's on 8 inch rims and the sprint top. A/C removed. 149,000 miles. Catalytic converter removed. Looks like 1 7/8" exhaust with stock header. And yep, those tires rub a little on a deep bumpy left turn.
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Old 07-17-2012, 07:00 PM   #5 (permalink)
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...almost 100% roads and highways. Yea I know, boring.
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Old 07-19-2012, 11:56 AM   #6 (permalink)
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Almost stock except a Thorley header and 2" exhaust, stock size tires. I average 23 mpg. Goes up to 25 if I take it easy, and down to 19 if I put my foot in it and try to keep up with interstate traffic.

Keep in mind that bigger tires will make your fuel economy seem better than it really is unless you regear the diffs to compensate.

EPA estimate is 24/27.

I think the exhaust, mainly the header, may be pulling mine down, making it run richer, since the O2 is only looking at the middle two cylinders. I feel that may also be killing my cats prematurely.
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Old 07-20-2012, 10:12 PM   #7 (permalink)
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87 with stock 1.3 and 31" x 10.5 and been getting 28 mpg. Today I put on a new set of 225/75 and they are running 10% over the gps but haven't checked the mpg yet. It sure drives better and I hope gets better mpg.
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Old 07-21-2012, 11:01 PM   #8 (permalink)
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I get right around 20. Weber carb, Pacesetter long tube header, 2" exhaust, no cat and a turbo muffler. 215/75/15 BFG Mud Terrains. Mostly short trips on rough dirt roads, with the occasional 15 mile trip to town. Stock engine burns oil, is down on compression and I drive it like I stole it. Foot to the floor and no mercy. I just bent one of my OME Dakar springs and all the shocks are leaking. Took a bad hop into the ditch on the main dirt road and hit a large rock with the left front tire. Tire survived. Spring is not looking too good. Still drives straight.
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Old 07-23-2012, 11:26 AM   #9 (permalink)
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Quote:
Originally Posted by mb4859 View Post
87 with stock 1.3 and 31" x 10.5 and been getting 28 mpg. Today I put on a new set of 225/75 and they are running 10% over the gps but haven't checked the mpg yet. It sure drives better and I hope gets better mpg.
This is a great example of the false fuel economy numbers bigger tires give. The stock tires are 26" The 31" tires are 19% taller so the fuel economy numbers are 19% higher than the actual numbers. With 28 indicated, you were actually getting about 23 mpg.The 225/75s are 28" and so your fuel economy numbers will be 8% higher than reality.
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Old 07-23-2012, 12:12 PM   #10 (permalink)
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Actually, if you think about it, a larger tire causes the axle to rotate less often than a smaller tire. Therefore showing fewer miles on the odometer than are actually traveled. So, larger tires have the opposite effect by creating "lost miles" and actually cause calculations to show poorer fuel economy than in reality. Although I'm not sure how larger tires could cause you to get better than EPA estimates haha.
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