Some cars leave a paper trail; the Mazda 737C left a name and a place in Mazda's list. What follows is what can be said with a source behind it.
Where it came from
The Mazda 737C is a prototype racing car that was built for Mazdaspeed for the 24 Hours of Le Mans under the Group C2 formula. It was the final evolution of the initial Mooncraft built design dating back to the 717C. It again used a 2-rotor 13B Wankel engine.
Two 737Cs were entered in the 1985 24 Hours of Le Mans, finishing 3rd and 6th in the C2 class. The 737Cs were also raced in part of the 1985 World Sportscar Championship season, managing 8th place for Mazdaspeed in the C2 teams championship. In the All Japan Sports Prototype Championship, Mazda was able to come home 5th in the constructor's championship. 737Cs later ended up in the hands of privateers for the JSPC after Mazda replaced them with the newer 757.
In context
Nearby in the Mazda catalogue sit the Mazda BT-50 and the Mazda T2000.
The money
EPA combined economy is 27 mpg, about $2,450 a year in fuel at the EPA's assumptions. Condition, mileage and specification move any single car a long way from a headline figure.