Yeah, I'm seeing a difference of 0.38W to maintain speed with the extra 1/4 lb, assuming you'll be in a break with somebody, and in the pack before that, your time will actually be the same. Throughout most of the race, you'll be costing yourself a whole 1/3 of a Watt.
I say I still win, because power needed to keep up is the important figure, unless this is a time trial.
It's still ****ing deflating though.