20. Buick Opel (1976-1979, Isuzu Gemini)

Rounding out our list is the Buick Opel, a compact car introduced during the fuel-conscious era of the late 1970s.
Under its American badge, it was a rebadged Isuzu Gemini, offering Buick showrooms an economical, reliable choice when efficiency mattered most.
This classic example underscores how Isuzu’s ingenuity and engineering have quietly supported major brands through changing times.