The Miller 91 was a state-of-the-art race car in the mid-1920s.  Named after the automotive genius Harry A. Miller, "91" denoted the size of the 1 1/2 liter engine in cubic inches.  

The supercharged inline 8-cylinder race engine developed 250 horsepower at 8000 rpm, incorporating a DOHC (double overhead cam) design and an intercooler.  

The #4 car depicted here was the FWD (front-wheel-drive) version, featuring a de Dion Tube front axle.  A total of ten FWD Miller cars were built, at $15,000.00 a copy. 

Without the driveline running through the driver's compartment, the seating could be positioned nine inches lower than a rear-drive application.  Shod with Firestone Balloon racing tires, these cars were fast.  

In 1930, a Miller 91 front-drive reached 180.9 mph, setting an international speed record.  Cars built by Miller won the Indianapolis 500 nine times, plus three additional wins utilizing Miller racing engines.