Sebastian Vettel has warned that F1's refuelling ban may lead to less exciting races in 2010.
The 22-year-old German, a championship favourite who was quickest at Wednesday's Jerez test in the new Red Bull car, said not allowing mid-race pit stops for additional fuel could make it harder for chasing drivers to catch up.
"It means there are far fewer strategic options," Vettel told Switzerland's Motorsport Aktuell.
"As long as you can drive away in front, the new rules are fine. But if you start further back, you will be missing some of the tactical components that refuelling allowed," said the 2009 championship runner-up.