Jenson Button thinks GP2, F1's second-tier support series, will run the premier category close for pace in 2014.
As the sport's all-new energy-recovery and V6 turbo-powered era kicked off at Jerez last week, drivers were impressed with the torque but concerned that the big reduction in downforce had slowed the cars too much in the corners.
The initial laptime gap compared to the same Jerez test last winter was a disastrous 10 seconds, but McLaren rookie Kevin Magnussen ultimately got the gap down to under 6 seconds.
Nonetheless, GP2 - with unchanged technical specifications - will come close in 2014.
"They will be a lot closer on certain circuits," 2009 world champion Button...
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