Brendon Hartley feels scoring a point on his Formula 1 debut in Sunday's United States Grand Prix "would be a dream" after being resigned to starting last due to an engine change penalty.

Porsche LMP1 driver Hartley was drafted in by Toro Rosso to stand in for Pierre Gasly in Austin due to a clash with the Super Formula season finale, and hit the ground running with a solid display through practice and qualifying.

Hartley finished less than one-tenth of a second off a place in Q2, eventually qualifying 18th, but will start from P20 due to a 25-place grid penalty following power unit changes made by Toro Rosso ahead of practice.

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“Obviously I’d love to be quicker but we knew we were starting at the back. We put a lot of focus on long runs, getting the peak performance out of this Pirelli tyre I didn’t get today," Hartley explained, having spent much of the weekend so far getting up to speed.

"Honestly I should be happy with how the weekend’s gone so far. I don’t do the 24 hours completely alone! It’s quick. It’s physical to drive."

When setting a target for his F1 debut, Hartley said: "A point would be a dream starting from the back. If I can move forward and put a race together, I’ll be happy."