Originally Posted By: steve20
Originally Posted By: ExMachina
Both LM Mos2 and the Lubegard (ebr1190rx) are good products that very likely work OK, but let's say you guys measure 19.6 mpg without, and 21.1 mpg with it in there. You will NEVER know if that delta 1.5 mpg was due to colder weather, different driving style slightly, less headwinds, tire pressure different, loads different. And if you walk around telling everyone your product works because of it, you'd be liars. Its just reality.
Like many folks, my driving routine is basically the same, week after week, after week. My trips are so routine, the low fuel light even comes on at the same traffic light--obviously not all the time, but frequently enough to identify a pattern. Maybe OP has the same type of routine driving where he can see a difference.
steve20, Wind has a huge influence on fuel economy. Temperature is moderately big too. Traffic might vary. Speed profiles important. So many factors sway the results, its useless to say "I got better MPG, but who knows what the differences were in wind, traffic patterns, grocery trips outside of the work routine, etc."