I hate to admit it, but my son, the car enthusiast was right. I have an 05
civic hybrid with about 4600 miles on it. And although it runs reasonably
well, I still felt it could use a little help in its quest to drive like a
"real" car. I just installed a K&N air filter, and this seems to have been
the trick. The car now accelerates and gets the kind of gas mileage I
assumed it should have when I purchased it. In mixed city/highway, it's
getting in the low to mid forties as opposed to the high thirties before
adding the filter. Furthermore, it is smoother and accelerates on a par
with most of the othe cars I tried to match up to today. In any case, I
think it's worth the investment.