A hundred pounds is a huge amount of weight in an Indy car. All one needs to do is measure the difference in speed between a fully fueled car, and a car running low on fuel to see the difference.
That being said, Robbie Gordon is acting like a fool and not helping his team at all. He needs to get over it and do the job he was hired to do.
According to media reports, Danica's crew was telling her to go slower from 226mph to 221 at the end to conserve fuel.
I guess she needed more caution laps...