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Old 08-14-2012, 07:15 AM
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2011 vs 2012 Gas Mileage

I noticed that the 2011 WK2's are listed at 22/16 and the 2012's are listed at 23/16. Did they do something different with the engine or get better mileage in 2012 or is this just marketing?
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Old 08-14-2012, 12:39 PM
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Re: 2011 vs 2012 Gas Mileage

Transmission is my guess.
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Old 08-14-2012, 02:51 PM
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Re: 2011 vs 2012 Gas Mileage

It's definitely not marketing as the test protocol is strictly controlled by the EPA.
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Old 08-14-2012, 03:22 PM
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Re: 2011 vs 2012 Gas Mileage

The difference is:

2011 (have engine driven powersteering pump)

2012 (have electromechanical powersteering pump)

The reduced load on the engine must be good for 1 mpg.
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Old 08-14-2012, 04:20 PM
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Interesting, thanks for the reply

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Old 08-15-2012, 06:56 AM
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Re: 2011 vs 2012 Gas Mileage

Quote:
Originally Posted by Jeep_addicted View Post
The difference is:

2011 (have engine driven powersteering pump)

2012 (have electromechanical powersteering pump)

The reduced load on the engine must be good for 1 mpg.
x2
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Old 08-26-2012, 09:33 PM
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Re: 2011 vs 2012 Gas Mileage

Quote:
Originally Posted by Jeep_addicted View Post
The difference is:

2011 (have engine driven powersteering pump)

2012 (have electromechanical powersteering pump)

The reduced load on the engine must be good for 1 mpg.
Is that true on both v6 and v8? I was under the impression that they did a PCM update that eeked out the extra mpg, and that they were flashing all 2011s (under a TSB or something) to the upgraded software so they would achieve the same mpg. Was this V8 only, or a figment of my imagination only?
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Old 08-30-2012, 04:38 PM
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Re: 2011 vs 2012 Gas Mileage

Quote:
Originally Posted by FAUEE View Post
Is that true on both v6 and v8? I was under the impression that they did a PCM update that eeked out the extra mpg, and that they were flashing all 2011s (under a TSB or something) to the upgraded software so they would achieve the same mpg. Was this V8 only, or a figment of my imagination only?
The v6 mpg increase is because of the switchover to the electro-hydraulic steering pump. There's actually one less pully on engine block now than on the 2011s. That one less pully is good for an extra 1 mpg.

The v8 mpg increase is because of the reprogrammed transmission that gave it the pseudo/quasi 6th gear. No change to the steering (i don't remember if it already has the electro pump or not.)
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Old 08-30-2012, 09:16 PM
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Re: 2011 vs 2012 Gas Mileage

Plenty of 2011s have the pump also, just not when it went to the EPA.
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Old 09-10-2012, 11:42 PM
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Re: 2011 vs 2012 Gas Mileage

is it true that 2011 5.7 can be reprogrammed to add a 6th gear by tsb?
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Old 09-11-2012, 03:30 PM
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Re: 2011 vs 2012 Gas Mileage

THIS QUESTION IS FOR montgb,,, how do you like the exhaust and cai you added. is the sound a little louder/ i hope, think about adding those myself. sorry i know this question is off track.

thanks for your input
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