Rahal lapped the 2.385-mile course in 1min16.9608sec, 0.7033sec ahead of the surprising Ed Carpenter Racing-Chevrolet of Spencer Pigot.

In third, however, was Scott Dixon’s Chip Ganassi Racing-Honda, a few hundredths ahead of Penske-Chevrolet’s Castroneves and Newgarden, as the four-time champion looks to overturn the qualifying form that saw Penske lock out the front two rows. Dixon is four points behind polesitter Newgarden in the championship chase.

Alexander Rossi and Marco Andretti both ran reds, and were sixth and seventh fastest, with their Andretti Autosport-Honda teammates Takuma Sato and Ryan Hunter-Reay in eighth and 10^th. RHR split the AJ Foyt Racing-Chevys of Carlos Munoz and COnor Daly.

Ahead of his final race for Chip Ganassi Racing, Max Chilton had a harmless spin in Turn 3, but rebounded to go 12^th fastest, but teammate Charlie Kimball was less lucky, braking issues causing him to complete only two laps just before the checker fell.

IndyCar debutant Zachary Claman DeMelo was 13^th for RLLR.

Sonoma, IndyCar warm-up

Cla	#	Driver	Laps	Time	Gap	Interval	Mph
1	15	Graham Rahal	20	1'16.9608			111.563
2	20	Spencer Pigot	18	1'17.6641	0.7033	0.7033	110.553
3	9	Scott Dixon	17	1'17.6849	0.7241	0.0208	110.523
4	3	Helio Castroneves	18	1'17.7481	0.7873	0.0632	110.434
5	2	Josef Newgarden	17	1'17.8073	0.8465	0.0592	110.350
6	98	Alexander Rossi	16	1'17.8557	0.8949	0.0484	110.281
7	27	Marco Andretti	15	1'17.8859	0.9251	0.0302	110.238
8	26	Takuma Sato	14	1'18.0077	1.0469	0.1218	110.066
9	14	Carlos Munoz	17	1'18.0513	1.0905	0.0436	110.005
10	28	Ryan Hunter-Reay	16	1'18.0926	1.1318	0.0413	109.946
11	4	Conor Daly	16	1'18.2189	1.2581	0.1263	109.769
12	8	Max Chilton	17	1'18.2747	1.3139	0.0558	109.691
13	13	Zachary Claman DeMelo	18	1'18.3122	1.3514	0.0375	109.638
14	21	J.R. Hildebrand	14	1'18.3124	1.3516	0.0002	109.638
15	18	Sébastien Bourdais	15	1'18.3286	1.3678	0.0162	109.615
16	1	Simon Pagenaud	19	1'18.3529	1.3921	0.0243	109.581
17	10	Tony Kanaan	15	1'18.4596	1.4988	0.1067	109.432
18	19	Ed Jones	17	1'18.6800	1.7192	0.2204	109.126
19	12	Will Power	18	1'18.7726	1.8118	0.0926	108.997
20	5	James Hinchcliffe	16	1'18.8155	1.8547	0.0429	108.938
21	7	Jack Harvey	15	1'19.2938	2.3330	0.4783	108.281
22	83	Charlie Kimball	2	1'19.9086	2.9478	0.6148	107.448