Honda is committed to the NTT IndyCar Series for the duration of its current engine supply contract, but the American arm of the Japanese auto giant says accelerating costs are giving rise to questions of whether it will continue beyond 2026.

“We have great concerns over the costs,” American Honda Motorsports Manager Chuck Schifsky told RACER. “If we were to choose not to renew, that would be the reason why. And it’s easy to see. We don’t have a third manufacturer, and there’s a reason for that: It has to do with the cost. If the return on investment matched up with the investment, we’d have a number of other manufacturers involved.”

The rising annual expenditures to supply more than half of IndyCar’s full-time field of 27 cars with purebred 2.2-liter twin-turbo V6 engines, and support 16-18 entries each May for the Indianapolis 500, has led Honda to contemplate a future without its brand involved in the series it joined in 1994.

“We’re looking for a wholesale change to the engine regulations so that we can eliminate fives and tens of millions of dollars of annual technical costs,” Schifsky said. “Because if we don’t, then it’s too much money, and we will go do something else. That something else could be NASCAR, or a further investment in our Formula 1 effort. Or something that isn’t motorsports at all.”