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I didn't really see much change in the mileage.
Boy I hope this is not true for me. I know of one truck like mine that has this done getting about 3-4mpg on the highway more than me. We'll see though. I know what my truck used to get and as soon as it's done I'll report the diffence. 
You're taking this quote out of context adventurer. Let me explain in numbers.
I was getting about 18mpg. Mixed city and highway with my 360 Ram. Confident it was over 20 straight highway but that's beside the point here. During my highway commute I regularly drove 120km/hr @ 2100rpm.
When I lost the od in my 518 I continued to drive it for the rest of the year using D on the highway. Not comfortable with the high Rpm's in 3rd with 3.55's. I decided to drive 100-105km/hr.
My mileage stayed around 17-18mpg.
Didn't actually try to test mileage in 3rd at 120km/hr but I'm sure it would have been less.
69 Super Bee, 93 Mustang LX, 04 Allure Super
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