Had you changed oil before? I read they use a thick oil to help break in the engine during its first few thousand miles. If you hadn't changed it, what was the "Oil Life %" your Civic was reporting?
I also have an 08 Civic LX, but mine is the 5-speed. I was wondering what kinds of driving you've been doing and what techniques you used to break 40mpg? As many details as you have the heart to spill, I'll lap them up
. Thanks!