yeah, I see what you're getting at with tags. I don't think we're set up for that kind of thing right now. I just did a quick search through the database and no one has used the tag 'supercharger', two users have used the tag 'afe' 3 times, and it's the same for 'k&n'. I just don't think we're at critical mass for niche tags like that to be much help--and we don't have any tools that show mileage trends for specific tags. You have to eyeball it now with your own data.
I think a Google search limited to Fuelly might work for some discovery of similar vehicles. Try a search at google like this:
site:fuelly.com Tacoma supercharger
Here it is. Looks like there are three people with Tacomas at the site that mention supercharger somewhere. All data at Fuelly is public, so Google should have most of it in their system.