Stealth Module
Posting Guru
Joined: Mar 2018
Posts: 1,055
Likes: 9
I decided to purchase an S&B cold air intake kit with the cleanable oiled filter. They also sell the same kit in the dry extended filter version. I ran my truck for about 2000 miles stock and averaged 16.0-16.1 mpg's. I leveled the truck and installed 37x12.50R20 Nitto Ridge Grapplers and the fuel mileage dropped to 13.5 mpg's after 500-750 miles. I added a Stealth module at the high setting and got back to 16.3-16.4 mpg's and the truck ran this way for about 2000 more miles. I recently added the S&B cold air intake kit and tested the mileage for close to 1000 miles to be sure I would drive in my "normal"style and not overly conservative or sporty/heavy footed. I am happy to say that I am now at 17.1-17.2 mpg's which was an increase in approximately .7-.8 mpg's. I calculated the mpg's by hand each time to make sure they always met the dash/on-board calculator. I drive roughly 12,000-15,000 miles per year with my truck completely dependent on how many vacation driving trips we take. With those numbers it will take 3.5-4 years to pay for the cold air intake kit at our current diesel price. So not a great return on investment but I completely love the sound of the new air intake kit and it always makes you feel better to see increased fuel mileage no matter how little. The next thing I want to do is schedule a dyno run to see the difference between stock and all the changes I have made.
Laughing Gas
Joined: Mar 2018
Posts: 1,147
Likes: 309
I decided to purchase an S&B cold air intake kit with the cleanable oiled filter. They also sell the same kit in the dry extended filter version. I ran my truck for about 2000 miles stock and averaged 16.0-16.1 mpg's. I leveled the truck and installed 37x12.50R20 Nitto Ridge Grapplers and the fuel mileage dropped to 13.5 mpg's after 500-750 miles. I added a Stealth module at the high setting and got back to 16.3-16.4 mpg's and the truck ran this way for about 2000 more miles. I recently added the S&B cold air intake kit and tested the mileage for close to 1000 miles to be sure I would drive in my "normal"style and not overly conservative or sporty/heavy footed. I am happy to say that I am now at 17.1-17.2 mpg's which was an increase in approximately .7-.8 mpg's. I calculated the mpg's by hand each time to make sure they always met the dash/on-board calculator. I drive roughly 12,000-15,000 miles per year with my truck completely dependent on how many vacation driving trips we take. With those numbers it will take 3.5-4 years to pay for the cold air intake kit at our current diesel price. So not a great return on investment but I completely love the sound of the new air intake kit and it always makes you feel better to see increased fuel mileage no matter how little. The next thing I want to do is schedule a dyno run to see the difference between stock and all the changes I have made.
Observer-expectancy effect
Posting Guru
Joined: Mar 2018
Posts: 1,055
Likes: 9
I was kind of thinking that also. Unless you compensate for the new tire size over stock - your dash mileage means nothing anymore, and so do the MPG calculations.
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Junior User
Joined: Mar 2018
Posts: 77
Likes: 1
I have added a Hypertech Speedo and odometer calibrator. I have checked it against highway mile markers to see how close it is. Not quite scientific but close enpugh fpr me. Also I have a friend that may have used his calibrated laser that only the "boys in blue" get issued. Yes he is a cop! MPH on the dash is correct. But not everyone believes that the cops really clocked them going that fast so I guess he could have lied to me. You don't have to believe a single thing I have posted and that is your right as an American. (Thanks to those in the military.) I am just posting my findings with my truck and how I drive. I don't state that anyone else will get the same results. Beauty of forums is there will always be haters that love to hate.
Laughing Gas
Joined: May 2017
Posts: 969
Likes: 30
Originally Posted by 2017F250Diesel
I have added a Hypertech Speedo and odometer calibrator. I have checked it against highway mile markers to see how close it is. Not quite scientific but close enpugh fpr me. Also I have a friend that may have used his calibrated laser that only the "boys in blue" get issued. Yes he is a cop! MPH on the dash is correct. But not everyone believes that the cops really clocked them going that fast so I guess he could have lied to me. You don't have to believe a single thing I have posted and that is your right as an American. (Thanks to those in the military.) I am just posting my findings with my truck and how I drive. I don't state that anyone else will get the same results. Beauty of forums is there will always be haters that love to hate.
Senior User
Joined: Oct 2016
Posts: 397
Likes: 8
From: SW New Mexico
I put an S&B Cold air kit on my 6.7L. It made a HUGE difference in the milage. I went from about 400 Miles to Empty on a fill up to as high as 524 MtE! No matter how I drive it is better mileage now than similar style driving before. In other words, whether it's towing, city driving or empty highway, all are better. WELL worth the $329. I do not have a Stealth. Think I'm going EZ Lynk.
Fleet Mechanic
Joined: Feb 2018
Posts: 1,592
Likes: 204
I put an S&B Cold air kit on my 6.7L. It made a HUGE difference in the milage. I went from about 400 Miles to Empty on a fill up to as high as 524 MtE! No matter how I drive it is better mileage now than similar style driving before. In other words, whether it's towing, city driving or empty highway, all are better. WELL worth the $329. I do not have a Stealth. Think I'm going EZ Lynk.
Laughing Gas
Joined: May 2015
Posts: 1,117
Likes: 2
From: Hatfield's side of river
I suspect that's exactly what is going to happen. Had a guy go down the same road locally with a 6.7 Ford. However, he was using one of those Amsoil extended oil change set ups, so the case was a bit different. He ended up loosing all the way around. His attorney charged him $20K to represent him all the way to the WV. Supreme Court. He ended up letting the bank repo the truck.
Yep, he sure showed them a thing or two!
Yep, he sure showed them a thing or two!
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Senior User
Joined: Oct 2016
Posts: 397
Likes: 8
From: SW New Mexico
That's what the computer figured. Turned out to actually be about 20%. And that is still going on after having it on for months now. I get about 20% increase whether loaded or not. I later did the EZ link and it did not improve much more; HOWEVER, that is with lots more power! So big power gain and held the 20% increase in mileage.
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