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  #11  
Old 10-09-2012, 04:31 AM
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Quote:
Originally Posted by gonefishin776 View Post
Interesting. For some reason I thought you sacrificed some MPG for power with the 91 octane tune. Is it worth it though with gas prices these days?
Think about it like this. If you have more hp and torque it takes less pedal to get it moving and it's more efficient. See my test here... http://www.ramforumz.com/showthread.php?t=102343
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  #12  
Old 10-09-2012, 08:56 AM
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Tuners definitely make a difference. I drove my truck for over a year on the 87, 91, and 93 tunes never averaging less than 15mpg. I drove it tuned stock for 2 weeks and averaged ~14mpg. I retuned it last week to the 93 tune and my current average is 16mpg.

I realized that the highway mpg is barely effected but the city mpg is greatly effected.
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  #13  
Old 10-09-2012, 09:15 AM
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I saw the opposite. I notice the biggest difference on highway driving with the mileage tune at least. What's weird is I was getting 18.8-19 mpg going to MD at 70mph. Then drove 700 miles to FL with the same tune and only got 17.3mpg at 70mph and 1900rpm. Altitude maybe? I thought it had the opposite effect though. And when I sped up 5mph to 75mph at just over 2000 rpms....forget about it...dropped to 14.9-15 mpg. I was so frustrated.

Also...Was cruising at 70mph for 100miles getting 17.8mpg. All of a sudden after 100miles it dropped to 17.3...why???? And on the way back same speed, 70mph was only getting 16.4mpg
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  #14  
Old 10-09-2012, 09:19 AM
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dunno there are so many factors. Plus we have different trucks/engines. With my 4.7L the tuner adds tremendous torque at low/mid rpms so I think that helps the truck get up to speed easier in city driving. It still helps on the highway but I don't see a huge difference. I've gotten as high as 23mpg avg on a highway trip at ~65mph on the 93 tune. That's not typical though, but 20,21 avg at 70mph is typical. Usually I only get higher than that if there's no wind. If there's any resistance it'll drop down closer to 20mpg, which is more typical. But even on stock tune I was getting ~20mpg avg at 70mph. Never really higher though.

From my experiences leaving FL and returning(have done many trips in many vehicles), the trip back to florida is always better on mpg due to driving down in elevation.
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  #15  
Old 10-09-2012, 09:30 AM
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Well I just chatted about it with my boss (who drag races and is familiar with this kind of talk). He says I was probably getting better MPG goin to MD through the mountains because at higher elevations there is way less moisture...you can't burn water..so you would see better fuel economy. Does that sound right? And it was raining coming back from FL so does moisture play a roll in way I only got 16.4 once it starting raining instead of 17.3? Next tank I'm going to try the 91 octane tune.
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  #16  
Old 10-09-2012, 09:35 AM
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I should also say I've never tried the "mpg" tune. I bought it mainly for performance(needed with the 4.7L) and the mpg increase is a bonus. Realistically paying more for 93 octane and getting better mpg is ~a wash.

As far as your mpg and the moisture thing I don't really know. There are just so many factors. Maybe that is true, but also there is less atmospheric pressure at higher elevation, so that'd hurt(less air). I've heard a slight amount of water can boost hp, maybe not on a regular street engine though, not sure. I know some guys do water injection but maybe that's to help to keep cool? Another thing I've heard is water injection can help keep the engine clean.

This is probably all irrelevant to a street engine though....I don't know enough about it...
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  #17  
Old 10-09-2012, 09:51 AM
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hmmm. I don't know either. Well I really do hope it's something EXTERNAL causing the fluctuations and not something with the truck. Anything I can check/clean/replace to ensure it isn't something with the truck?
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  #18  
Old 10-09-2012, 09:57 AM
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If it runs good, no engine lights, has power, etc I wouldn't worry about it. How many miles does it have? The mpg you posted is pretty good actually for a 3rd gen hemi without MDS.
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  #19  
Old 10-09-2012, 10:12 AM
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it has about 72K miles.
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  #20  
Old 10-09-2012, 10:16 AM
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I'm sure it's fine/normal. My brother has a 3rd gen non mds hemi big horn and I think gets like 12mpg city. My friend had a 3rd gen non mds laramie hemi and it go ~15 avg IIRC. both quad cabs. My brother's is 4wd dunno gearing, my buddy's was 2wd w/ 3.92.
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