I don't know what circuits Anderson was looking at but Catalunya lap times suggest a drop off of around 2 seconds a lap since 2010. Also, I am sure I was not alone among "fans" who have note been happy about the tyre thing long before teams and drivers piped up about it.
From Rootersport : http://cliptheapex.com/threads/rootersport.3653/page-4#post-198803
Quote "... The Spanish Grand Prix - a Recent History - In Stat's ...
2013
Pole: Nico Rosberg, Mercedes - 1:20.718
Fastest lap: Esteban Gutiérrez - Sauber-Ferrari - 1:26.217 (lap 56)
Winner: Fernando Alonso - race time: 1:39:16.596
Lapped everyone up to and including Daniel Ricciardo in 10th.
Weather: Sunny
2012
Pole: Pastor Maldonado - Williams-Renault - 1:22.285
Fastest lap Romain Grosjean - Lotus-Renault - 1:26.250 (lap 53)
Winner Pastor Maldonado - Williams-Renault - 1:39:09.145
Lapped everyone up to and including Nico Hulkenberg in 10th.
Weather: Partially cloudy, dry – air temperature 22 °C (72 °F) track temperature 35 °C (95°F), 6 °C (11 °F).
2011
Pole: Mark Webber - Red Bull-Renault - 1:20.981
Fastest lap: Lewis Hamilton - McLaren-Mercedes -1:26.727 (lap 52)
Winner: Sebastian Vettel - Red Bull-Renault – 1:39:03.301
Lapped everyone up to and including Alonso in 5th.
Weather: Mainly sunny,Fine and Dry, Air Temp 27 °C (81 °F), Track Temp 33 °C (91 °F) to 44 °C (111 °F)
2010
Pole: Mark Webber - Red Bull-Renault - 1:19.995
Fastest lap: Lewis Hamilton - McLaren-Mercedes - 1:24.357 (lap 59)
Winner: Mark Webber - Red Bull-Renault - 1:35:44.101
Lapped everyone up to and including Rubens Barrichello in 9th.
Weather: Mainly cloudy, dry
2009*
Pole: Jenson Button, Brawn-Mercedes - 1:20.527
Fastest lap: Rubens Barrichello, Brawn-Mercedes - 1:22.762(lap 28)
Winner: Jenson Button, Brawn-Mercedes - 1:37:19.202
Lapped everyone up to and including Lewis Hamilton in 9th.
Total race time included 4 lap Safety Car period
Weather: Warm, Sunny
2008
Pole: Kimi Räikkönen, Ferrari - 1:21.813
Fastest lap: Kimi Räikkönen - 1:21.670 (lap 46)
Winner: Kimi Räikkönen - 1:38:19.051
Lapped everyone up to and including 10th placed G Fisichella
Total race time included 4 lap Safety Car period
Weather: Sunny - air temperature 23 °C (73 °F), track temperature 38 °C (100 °F)
2007
Pole: Felipe Massa, Ferrari - 1:21.421
Fastest lap: Felipe Massa - 1:22.680 (lap 14)
Winner: Felipe Massa - 1:31:36.230**
Lapped everyone up to and including Takumo Sato in 8th.
Weather: Sunny and warm
Notes:
*Refuelling ban invoked for 2010 onward.
** 2007 First start aborted when Jarno Trulli (Toyota) stalled on grid, causing 2nd formation lap and race reduced to 65 laps.
Finally, just for laff's, 2006 Last season of before the rubbish track modification to the last corner
Pole: Fernando Alonso, Renault - 1:14.648
Fastest lap: Felipe Massa - 1:16.648 (lap 42)
Winner: Fernando Alonso - 1:26:21.759
Lapped everyone up to and including Mark Webber in 9th.
I know my conclusions, now draw your own ... " End quote