For me apexing turns and costing down giant hills are the "fun" parts of FE.
*This may put you at risk on the road*
If I get the chance I will apex a turn on multi-lane roads by cutting over multiple lanes. I start the turn in the fast lane insted of the turning lane. Obviously this won't help mpg too much (because there are few safe oprotunities to do it), but every little bit helps.
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2008 EPA adjusted:

Distance traveled by bicycle in 2007= 1,830ish miles
Average commute speed=25mph (yes, that's in a car)