[sevenspeed]

Thanks, and I do have an Ultra gauge but even the roads that appear flat are not around here so I'll have to do an average not steady state.
So would removing the resonator box make any difference in mpg? It is a restriction but how much I don't know.
I assumed aftermarket filters would filter better too, newer technology. The reason I asked about the AEM is it is not an oil filter and tests showed it filters excellent with K&N just very good but they didn't include a paper filter in the test.

Unrelated but is your 96 Civic a stock motor or a Vx? That's awesome mileage. I'm trying to balance between Hypermile and mild driving. I don't do anything that would cause extra strain on the drivetrain like pulse and glide (clutch wear.) And with the Ultra gauge at least for now I'm not doing EOC when I get to my destination either since I don't think it would read mpg anymore even if I had a kill switch.