It's not true, the cars will be 1800mm wide according to the regulations.

... I know that I've read that somewhere... but after thinking more about it, maybe I just have mixed the A1GP Ferrari up with the Formula 1

so sry

EDIT: final day scorings

P Driver Chassis / Engine T Time Gap Laps
1 S. Vettel Red Bull Racing RB4 / Renault B 1:19.295 75
2 S. Bourdais Scuderia Toro Rosso STR3 / Ferrari B 1:19.839 + 0.544 122
3 S. Buemi (T) Scuderia Toro Rosso STR3 / Ferrari B 1:20.154 + 0.859 115
4 G. Paffett (T) McLaren MP4-23 / Mercedes B 1:21.140 + 1.845 81
5 J. Button Honda Racing RA108 / Honda B 1:21.387 + 2.092 94
6 C. Klien (T) BMW Sauber F1.08B (KERS) / BMW B 1:21.534 + 2.239 88
7 N. Heidfeld BMW Sauber F1.08 / BMW B 1:21.592 + 2.297 105
8 B. Senna (T) Honda Racing RA108 / Honda B 1:21.676 + 2.381 106
9 N. Piquet jr Renault R28 / Renault B 1:22.148 + 2.853 94
10 N. Hülkenberg (T) Williams FW30 / Toyota B 1:22.410 + 3.115 51
11 L. Badoer (T) Ferrari F2008K / Ferrari B 1:22.866 + 3.571 120
12 G. Fisichella Force India VJM01 / Ferrari B 1:23.068 + 3.773 92
13 P. d. l. Rosa (T) Force India VJM01 / Ferrari B 1:23.103 + 3.808 88