Could the Hondas really have been running heavy?

From Honda's official press release:

Jacky Eeckelaert, Engineering Director
"Our plan for today was to run through our usual race preparation programme with set-up work during the morning session, then focusing on long runs in the afternoon. In view of the damp conditions, we adapted the programme slightly. Rubens' afternoon was brought to an early conclusion as he spun entering the last corner causing some damage to the car. Unfortunately we were unable to repair it in time to take part in the rest of the session. Jenson completed his planned programme giving us some valuable data to study this evening as we work to improve the balance of the car before qualifying tomorrow."

Okay... so Honda were doing set-up work in the afternoon when they were reasonably quick, and long runs in the afternoon. Hmm... so they were running heavy?

"The cars will now have fresh engines installed overnight, ahead of tomorrow’s opening qualifying session of the year."

Or maybe they were running on slower engines. :D