American car buyers are showing renewed interest in smaller vehicles, with General Motors reporting a significant third-quarter increase in sales of its Chevrolet Trax and Trailblazer small SUVs. Hyundai Elantra sedan sales rose 18%, while Toyota’s small Corolla has posted a sharp increase this year. Each of those vehicles has a starting sticker price below $25,000. By contrast, several larger SUVs struggled: GM reported lower sales of the Chevrolet Suburban and Tahoe, Hyundai’s three-row Palisade fell 1% in the third quarter, and Jeep’s Grand Cherokee declined 30%.