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really bad gas mileage

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Old Dec 7, 2010 | 11:40 AM
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Default really bad gas mileage

did a readylift 2.5 front and 1.5 rear now running mickeythompson baja atz 35/12.5/20 only getting 200 miles on a tank does this seem right ???i have a 2010 ram sport crew 4wd 3.92 gears,98 litre tank,inferno red
 

Last edited by hemiflht; Dec 7, 2010 at 11:48 AM.
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Old Dec 7, 2010 | 11:45 AM
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You've got a truck that puts out almost 400 HP at the crank, you've gotten rid of what little aerodynamics the truck shipped from the factory with, you are running heavy 35" tires with a LOT of rolling resistance on big, heavy 20" wheels.
What do you think?
 
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Old Dec 7, 2010 | 11:52 AM
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Did you do any sort of speedo correction for the 35's?
 
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Old Dec 7, 2010 | 11:56 AM
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No pain no joy.
 
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Old Dec 7, 2010 | 12:29 PM
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Originally Posted by oldjeep
Did you do any sort of speedo correction for the 35's?
If you did not correct the speedo, then the odometer is reading low

if you went from 31"" to 35" tires, you actually traveled 11% more miles
if you went from 33"" to 35" tires, you actually traveled 6% more miles
 
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Old Dec 7, 2010 | 02:15 PM
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I have pretty much the same setup and I have corrected the speedo and I get about 350 miles per tank with the 26 gallon tank. There is an issue.
 
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Old Dec 7, 2010 | 02:16 PM
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haven't done speedo correction yet but friends who have done the same lost about 3miles per gallon before i wz getting around 18miles pg avg. now im getting 10-11 driving like a grandma just doesn't seem right.Going to get the speedo done next week .Love the truck love the way it looks hopefully mileage will get better !!!! I was getting better mileage towing a loaded 14 foot cargo trailer with the stock truck.New to the forum just looking for insight will post some pics soon. thanks . p.s. went from 33" to the 35"s
 
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Old Dec 7, 2010 | 08:03 PM
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That doesnt sound right. I have the larger tank and get 400 miles to a tank. I also live in Hi so i avg horrible mpg...about 13-14 hand calculated
17's and stock Wranglers
 
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Old Dec 7, 2010 | 08:36 PM
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You are also in Toronto. All MPGs, even stock trucks, took a hit over the past 4 weeks, it is called COLD weather (what is the global warming I keep hearing about?). Combine that with your changes and lack of speedo correction... You are in the ball park.

The weather/winter gas took between 2 and 3 MPGs from me. EVIC went from 17 to mid 14s and hand calcs are not far off from the EVIC.

This is why I put stock rubber size back on mine... I drive to far and have to watch what I do. If I drove less than 10 miles to work I would lift in a heartbeat! I already have one truck that is hard to get double digits with....
 

Last edited by CarGuyOhio; Dec 7, 2010 at 08:45 PM.
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Old Dec 7, 2010 | 09:23 PM
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[quote=CarGuyOhio;2342678]
The weather/winter gas took between 2 and 3 MPGs from me. EVIC went from 17 to mid 14s and hand calcs are not far off from the EVIC.

[quote]

I just did 300 miles, mostly on the highway. Hand calculated 21imp (17.4US?) and the temperature was fairly cold. This was mostly running at about 60mph. I'm ok with this, as it equals the mileage I got with my F150 2WD with nearly 200 less hp.
 
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