There will also be a marginal effect from the lower moment of inertia of the smaller wheels requiring less torque to spin them up, releasing more to accelerate the car. I did see the maths on this once, and even understood it, but it was a long time ago now, so it's been pushed to an inaccessible corner of my memory. The context I saw it in was 1:1 vehicles chasing hundredths on the drag strip. Whether the effect would be even measurable at our scales, I've no idea.