Well, I don't do any exzessive hypermilig, but try to drive sensibly. That ist, anticipating traffic, breaking less and generally driving as smooth as possible.
And you know what?
The girls like it. They notice I am NOT trying to impress them with some reckless stunts, as they would expect alle male drivers to do, and attribute that to maturity and self-consiousness.
So you stand out of the crowd in a positive way.
Could be worse, heh?
So leave the spirited driving for a weekend out with the guys, and do some mild hypermiling when chicks are on board.