When you read the auto magazine reviews, you'll see a lot of low reported mileages...mpgs often somewhere below 20. So far, I have not flogged my Si nearly at all. I wanted to break it in thoroughly first, and would prefer to get it on a track to really play around, see its limits. As such, I'm getting a feel for "normal" driving city and highway mpg. So far, it looks like I will get about 23/28 typical city/highway, with 20-21 as a bare minimum (pure city) and maybe 32-33 maximum (pure highway).
In other words, this engine is very sensitive to driving habits with a huge range of possible mpg...if you drive it like the speed demon it is, you'll get speed demon mileage (sub-20). Drive it like any 'ol 2-liter and you'll get respectable 2-liter mileage, and drive it like Grandma and get Grandma mileage. I love that...means I can have my cake (save dollars driving to work) and eat it too (drive very fast when I want)
