PwrSmoke
Full Access Member
That sounds reasonable, but my definition of "power gain" had always been, pulling x up a hill and not having to down shift to maintain a certain speed.
Not just a feeling or sound
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How I would answer that is varying conditions. Maybe one day the air is cooler and the engine develops a little more power. Or the atmospheric pressure was higher, or you had a good load of fuel that time. Or one time you were carrying a little extra weight and the next you weren't (both tanks full vs only one tank half full). The oil was warmer one time than another so there was less parasitical drag on the engine. All these things, and more, and combinations, all effect power output and unless you can equalize the conditions, you don't know if it was the product you added or other factors.
You can reach conclusions based on averages. Say you drive to work up the same hill every day. So every day for a year you record the maximum speed achieved on the hill and you try to maintain most other variables the same... same general load in the truck, tire pressure, same fuel quality, etc. At the end of the year, you average the results across the entire season, or for a period of time in one season. Then, you start adding something to the mix and run another year recording and average those results. Unless there were huge difference in the climate one year to the next, the averages would be a reasonable comparison. I have about 27 years worth of averaging on my '86's fuel economy, for example