Put a set of .120 tubes in my truck a couple of days ago. More fuel drive ability suffered a little has more of a buck at 1100 to 1300 rpms. It takes more cranks to start it but I drove it about 50 miles today and no issues if drove normally or anything. No rough idle like I was hearing about pretty happy with it will see if there is benefits with a sled behind it or not.

 

what are the expected powergains from the tubes?