HLram
Senior Member
- Joined
- Dec 22, 2012
- Posts
- 1,174
- Reaction score
- 229
- Location
- Texas
- Ram Year
- 2012 and 2007
- Engine
- Hemi 5.7 in both
I have hand calculated on all my trucks I have owned. These two Dodges are both about a half mpg off on the overhead. But the difference is in several trips from East Texas to South Texas and back. And I do mean SEVERAL. Even if I wasn't hand calculating it, I can definitely tell a difference between trips with the amount of gas it takes to get there and how much I spend on gas to do it. I have not tried the lower octane tunes on my 12 model, just the 93 on the DS, BD, and the Hemifever tune. All running 93 fuel. But on the 07 truck, many attempts with various tunes and fuel octane ratings. I personally (just my experience with this truck) get better mileage running 93. The 12 model is modded fairly good with 3.55s and the 07 just has a K and N filter and a 22'' Magnaflow, with 3.92s and 165,000 miles on it. They actually both get about the same gas mileage. As for your overhead being trustworthy, I would check it vs the actual hand calculated mileage. Every truck is going to be different. My two just happen to be close. I have had a few in the past that were way off though.
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