Brant James

USA TODAY Sports

Season finale: at Sonoma, Calif., 6:30 p.m. Sept. 17, NBCSN

WATKINS GLEN, N.Y. – IndyCar’s 2018 schedule is essentially complete except for one prospective new date, so Mark Miles, president and chief executive officer of Hulman & Company, which owns the series, is giving those organizers more time. And a bit more, still, if it will help them complete a viable plan to add Mexico City to what would be a 17-event slate.

Miles told USA TODAY Sports on Sunday at Watkins Glen International that he hopes to place a race at Autodromo Hermanos Rodriguez, a 2.7-mile road course located within a park that currently hosts Formula 1 and staged NASCAR Xfinity Series races from 2005-08. Miles wants a resolution in two weeks, when the IndyCar season concludes at Sonoma Raceway.

“I hope by Sonoma, but if I think four days later we can get it done, we’ll give them four more days,” he said.

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Miles said he would seek to slot the race in what this season was a hole between the July 30 event at Mid-Ohio and Aug. 20 at Pocono.

“It’s North American, so its analogous to Toronto,” Miles said. “We drive, we don’t fly away to get there.

“We’ve got an extra hole (in the schedule). We’ve got three weeks. I’d like to fill one of those.”

Miles is awaiting a formalized proposal from the prospective promoters, whom he would not identify. IndyCar has had races evaporate in each of the last two seasons, in Brazil in 2015 because of governmental problems and in 2016 in Boston because of permitting and financial woes surrounding the promoter. A race in China was vacated by a mayor about two months before its scheduled running in 2012 because it conflicted with a local beer festival.

“We need to just have everything that’s been said finally documented,” Miles said of the Mexico City proposal. “And then there’s the money. That’s not to be disparaging to the people, but we have always require meaningful letters of credit up front.”

IndyCar collected $16 million in sanction fees for two races in Brasilia although they were never held. The series refunded $925,000 to ticket-buyers of the Boston race in an agreement reached with Massachusetts Attorney General Maura Healey.