I used the large bit Tracy, always use the largest bit I can.
Tailpipe has a nice odor to it, not the usual gas odor.
I'm still doing testing, and getting stuck in traffic on my long distance test didn't help. 2.5 hours to go 10 miles... yeah, mpg killer there. Still saw 45 mpg in 430 mile trip with 2 days of very aggressive driving in Dallas, TX. If I am not doing 70-75 on the interstate my averages are sitting at around 54-56 mpg, but i'm still doing some testing.
In town i'm seeing 35-40 mpg, it would be 40 if I didn't have a stoplight every 3/4 of a mile. When I can catch 2-3 lights green in a row my mileage jumps 4-5 mpg in a single 5 mile trip.
Still need to gap the plugs and maybe play with the aspirin amount in the mpg remedy a little. Think it might be time to order the HF civic belly panels, only 2 panels are different from the lx to hf civic. These mods might be later in the fall, I have a master bath remodel that has priority over more modifications.
If I break the mid 50's i'll let you all know.
Ken