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  #1  
Old 01-02-2013, 09:21 AM
jb502 jb502 is offline
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Default MPG's, break-in, and bigger tire question

So, my mpg's are not what i expected. my 2010 was quite a bit better. I only have 245 miles on this one though. If i'm on level ground going 60-65, i'm only getting 15 mpg. whereas my 2010 would be aroudn 19-20.

Will this get better with more miles, and how much better, 2-3 mpg's?

Or is this the price a pay for getting 295 60R 20 nitto terra grapplers?

While the tires are not huge, they are bigger than stock, but I wouldn't expect it drop mpg by 3 or 4.

I have 3.55 rear end. On level ground going 60-65, the truck will never go into eco mode until i let off, or go down a hill. my 2010 could keep at 60-65 and as long as the ground was level, it would go into eco mode.

Any thoughts on all this? Will it get better with miles? How much better? Or did i screw myself with the bigger tires?

My average right now is at 12.9, and thats mosty highway miles. not always flat, there are some small hills on my route to work, but basically just going from home to work, 95% highway. 12.9 MPG.
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Old 01-02-2013, 09:40 AM
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Did the 2010 have the same rear end ratio? Is the stock tire size still programmed into the TIPM or have you used a tuner to program in the current tire size? This will have an effect on calculated economy.
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Old 01-02-2013, 09:49 AM
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You know, i am not sure exactly what the ratio on my 2010 was, but I know it was either 3.55 or 3.92. It was not 3.21.

The dealer put the tires and rims on before i took delivery, so I am assuming that they changed the size on the computer. When check my speed with gps, the speedo is accurate
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Old 01-02-2013, 10:04 AM
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I don't know that I would trust that they reprogrammed it, so you may want to ask them to check the next time you have it in for service. I suspect that the larger tires are causing your engine to work harder to move the truck and this is causing the reduction in mileage. Northeast Tennessee is a mountainous area and most stock Rams around here average about 15 m.p.g. unless you have a leadfoot driver with 3.92 gears.
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Old 01-02-2013, 10:10 AM
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Quote:
Originally Posted by RamTech View Post
I don't know that I would trust that they reprogrammed it, so you may want to ask them to check the next time you have it in for service. I suspect that the larger tires are causing your engine to work harder to move the truck and this is causing the reduction in mileage. Northeast Tennessee is a mountainous area and most stock Rams around here average about 15 m.p.g. unless you have a leadfoot driver with 3.92 gears.
Wouldn't the speedo be off if they didn't reprogram it?
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Old 01-02-2013, 11:03 AM
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New truck not yet broken in, larger tires with more traction, cold weather winter blend fuel & any idling to warm up would = bad fuel mileage in this small window scenario.
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Old 01-02-2013, 11:24 AM
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Quote:
Originally Posted by T48 View Post
New truck not yet broken in, larger tires with more traction, cold weather winter blend fuel & any idling to warm up would = bad fuel mileage in this small window scenario.
SO, in your opinion it will get better when the truck is broken in? how many miles does it take? are we talking 1000, or 10,000?
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Old 01-02-2013, 01:00 PM
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Quote:
Originally Posted by jb502 View Post
Wouldn't the speedo be off if they didn't reprogram it?
I would think so as well. The reason I question it is because the size tire you have isn't one of the optional sizes that a technician can select when programming in the current size.
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Old 01-02-2013, 01:21 PM
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Quote:
Originally Posted by RamTech View Post
I would think so as well. The reason I question it is because the size tire you have isn't one of the optional sizes that a technician can select when programming in the current size.

Really? if thats the case, how can it ever be programmed correctly? I'm not doubting you, i'm just asking how it can be done right, if you know of any way?
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Old 01-02-2013, 01:31 PM
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Aftermarket tuners off more programming options for these trucks than Chrysler. They only offer programming options for he factory tire sizes. If the dealer did reprogram it, they likely used the largest tire option available to them and got pretty close to it.
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