Mexico still a 2018 possibility for IndyCar - Miles

"Yes, I think there is still a possibility of adding Mexico City for next year," Miles said. "We felt like with Portland being nailed down, most of the schedule – a schedule we're happy to have as our final schedule for next year – is set [and] ought to be public. But there is ongoing work in Mexico City to get to the track there. I think it's quite close. We're optimistic about the possibility, even to be added for the 2018 schedule.

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"If it happens, it will be in there probably just after Mid-Ohio (July 29, -Ed.), where we have a little longer break in the middle of our summer than we'd like. Everything we know about the opportunity there is exciting. Great track, great facility. Obviously huge market. A lot of open-wheel fans and IndyCar fans. We hope that can come together, but the schedule works for us if it doesn't.

"We have not presented a final deadline for that. It would be a combination of what they would need time-wise to be successful in promoting an event in early August. But from our perspective, it could be added down the road."

Miles also emphasized that the replacement of Watkins Glen with Portland should not be taken as a breakdown in the relationship between IndyCar and the upstate New York road course.

"It would be completely unfair to characterize this as them bailing out," Miles said of Watkins Glen. "It was very mutual – great respect. We appreciated the discussions and the process.

"There were discussions with them where we kind of looked week by week from early September, earlier into the summer. There just wasn't a week that worked on our calendars and theirs.

"We considered all kinds of possibilities, maybe even kind of partnering with other events they already had on their schedule, which would have been interesting. But in the end, just none of them really were feasible at this time.

"We will continue to keep a dialogue with them. If there is a time when we can revisit it, we'll be eager to do so."