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  #11  
Old 01-23-2013, 06:02 PM
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Chadster, what was your actual mpg with 6" and 35's?
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  #12  
Old 01-23-2013, 08:41 PM
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Lift = Bad MPG.. Unless you have a diesel....

I expected crappy mileage. A lift was more important to me than mpg. I mean I am still over 10mpg so I am happy. I am just glad it didnt drop under 10mpg.. I get an avg of 11-13 city and 15-16 hwy and I am perfectly happy. I do have an S&B getting installed tomorrow and then doing a 85mm throttle body, catch can, magnaflow, and eventually a trinity to all help me get back.

One think you can do is gears. Gears will dramatically help.
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  #13  
Old 01-24-2013, 04:49 AM
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Your tires are not taking longer to realize that they are making one turn.

You are covering more distance with every revolution so you are going fast than you actually show. Also meaning your computer thinks you are traveling less distance than the fuel its consuming.

My speedo is correct I have trinity 87 tune. K&N intake. no muffler. 5.5" lift on 35s and am lucky to see 14 highway and 11 city.

Maybe the 37s put the truck in a better sweet spot for rpms for mileage or something because I'm not seeing it. Plus no gear options for the 2012s. I'm looking to trade mine in or just say eff it.
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  #14  
Old 01-24-2013, 04:53 AM
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Ram 725 do you have 3.55?
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  #15  
Old 01-24-2013, 07:33 AM
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Quote:
Originally Posted by HoosierHemi View Post
taller= more wind resistance
bigger tires= more weight= more rolling mass to move
all these will suck your MPGs!

Recalibrating will make your numbers worse since right now you're tires are bigger than stock so since it takes longer to make 1 revolution to compute the speed/distance its why you're reading you're probably going 3-5 mph slower than actual...the good part is you'll show fewer miles on the truck at trade in
Unless I misunderstood, I think you have this a little backwards. You are correct about the speedo reading slower than he is actually traveling. But by that same line of thinking, the truck is actually traveling a greater distance than the computer is counting because those 35's cover more ground per revolution than the stockers did. So if he is basing his fuel economy numbers on what the truck is telling him, then the numbers should actually improve if he gets the truck calibrated. I would not expect much of an improvement though, lol.

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Originally Posted by GymRat View Post
How do you get your truck reprogrammed for tire size? And with the stock tires measuring 33" (275/60/r20) on heavy stock 20's I figured running 35's with some aluminum 18's wouldn't make too much of a difference in weight, and therefore fuel economy. Am I wrong in thinking this?
I believe the dealer can reprogram your truck for the larger tires. You can also buy a relatively inexpensive plug-in tuner just for the purpose of reprogramming it yourself. I think maybe Hypertech makes it? Lastly, you could invest in a true programmer/tuner like Superchips which should give you the option to reprogram the tire size along with the fuel economy/performance tuning options.

I don't know about the difference in the weight of the stock 20" wheels vs. the 18's but my guess is that there isn't as much difference as you might think. As for the tires, what tire are you running? I'm assuming it's a good chance it's a mud tire since you are running 35's? Mud tires weigh quite a bit more than similarly sized street or A/T tires, sometimes nearly twice as much. Your stock 20" tire probably weighed around 45 pounds each. Besides being a thick, heavy mud tire (if it is) your new tires are 2" taller, have much larger sidewalls than your 20's, and are most likely wider too.

As others have said, more mass for your truck to get moving and more rolling resistance combined with already sub-par fuel economy means you better not pass up a fuel station when you see one, lol. Hope this helps you understand.
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  #16  
Old 01-24-2013, 10:12 PM
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I went from 14MPG (mix of city and highway) with stock 20's on a 4" lift

to 11MPG with 35" tires on same lift.
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  #17  
Old 01-24-2013, 11:17 PM
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One of you guys needs my hypertech!!!

The shitty mpgs is just part of it.
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  #18  
Old 01-24-2013, 11:28 PM
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You bought a HEMI, in a truck for pete's sake. If you are tired of your crappy gas mileage, stop complaining and go buy a Nissan Leaf or something. It is a truck, that does not get, nor will ever get astronomical gas mileage. If you lift it and put bigger tires on it, grab a straw and suck it up! This is like asking why fuel consumption goes through the roof when pulling a 6,000 trailer behind you......
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  #19  
Old 01-25-2013, 01:42 AM
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Yes, but this is something that could be corrected if gear sets were available for our trucks. But no. We have to do an axle swap in the front and machine work to the rear to get them in a 2012. I intend on getting rid of my truck and getting back in a diesel. My last truck would do 19mpg with 35s doing 80 on the highway.
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  #20  
Old 01-25-2013, 01:52 AM
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Quote:
Originally Posted by mattman13 View Post
Yes, but this is something that could be corrected if gear sets were available for our trucks. But no. We have to do an axle swap in the front and machine work to the rear to get them in a 2012. I intend on getting rid of my truck and getting back in a diesel. My last truck would do 19mpg with 35s doing 80 on the highway.
I feel your pain. My cummins on 37s did just fine. I wish I didn't have to go crazy for gears... I'll stick my 1/2 ton for a little while then step it up to a diesel again.

In all honesty I am really happy with my ram 1500
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