The newer Hondas will run 2/4 cylinder modes depending on load, they also now have CVT's. The v6's got the cylinder deactivation with the 2008 model refresh. The 4 bangers came later on.

When I had my 5 speed Civic, I often skipped gears and coasted a lot. I never got less than 34mpg in city driving. On the highway, it usually did 42-44. Was a great commuter car during the gas crisis ~10 years ago!

__________________
Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)