Originally Posted by jsr72
The Focus steel wheel is a considerably heavier than the alloys.
You're correct, thanks. I think I was thinking of a next-size-up alloy being heavier, which is stating the obvious. Duh. This article on the C&D website was interesting. 16" alloys on a Golf were heavier than 15" steelies and caused the car to get slightly less mpg and was a little slower to 60. By this logic the Ti w/ 18's should be significantly slower than an S with 15's.
I still think the SFE's wheels and hubcaps are a marketing gimmick though. Why else would several other hybrids and cars in "eco" trim get multispoke alloys if they significantly degraded mpgs?