2000 SE Sport 2.5L MTX with a K&N cone filter.
I average around 26.5-27.5 going to work and back which isn't heavy traffic but just a few starts and stops.
I usually get around 24 in heavy traffic and the best so far has been 32.2 highway since running Shell Vpower premium. I was getting a best of 24.5 to work and back before running the Shell stuff.