the case in Indycar, 85% ethanol, or NASCAR, 15% ethanol). Pro stock fuel systems flow the gasoline at 7.5 US gallons per minute (0.5 L/s). In addition to all of these specifications, each car must: Weigh a minimum of , including driver (2,450 pounds for Mountain Motor formula cars) In NHRA competition, the cars must be produced within the last five model years (2011–2015). In the late 1980s and into the 1990s, car sizes increased as mid-size family sedans had become the car of choice, but cars shrank by the 2000s (decade) as compact cars, banking off the popularity then of the sport compact class, became the trend, as General Motors and Daimler (then owning the Dodge brand) began using compact cars (similar to pro RWD except for the engine). However, that the push back to pony cars and mid-size family sedans became the choice again, as Ford uses a "pony car" and Dodge and Chevrolet began using mid-size family sedans. The 2013 legal cars are the Chevrolet Camaro, Dodge Avenger, and Ford Mustang. For 2014, Fiat teams are transitioning to the Dodge Dart. Rear spoilers cannot be longer than , measured from the body-line-to-spoiler transition point to the tip. Complete stock headlights, parking lights and taillights must be retained in the original factory location. This makes for some incredibly tight racing; the front runners in the class can reach speeds over in 6.47 seconds (approx). The qualifications rounds are separated by less than a tenth of a second across all competitors. In a particularly tight qualifying roster, the difference from No. 1 to the final No. 16 qualifier may be only .05 seconds. Mountain Motor cars, because of their massive, 800+ cubic inch, mountain motors, dip into the 6.30s at almost . At the 2019 NHRA Houston Raceway Park race, where the Mountain Motor formula replaced the NHRA formula, the fastest car reached 6.233 seconds. NHRA pro stock champions (1970–present) 1970 - Ronnie Sox 1971 - Mike Fons 1972 - Bill Jenkins 1973 - Wayne Gapp 1974 - Bob Glidden 1975 - Bob Glidden 1976 - Larry Lombardo 1977 - Don Nicholson 1978 - Bob Glidden 1979 - Bob Glidden 1980 - Bob Glidden 1981 - Lee Shepherd 1982 - Lee Shepherd 1983 - Lee Shepherd 1984 - Lee Shepherd 1985 - Bob Glidden 1986 - Bob Glidden 1987 - Bob Glidden 1988 - Bob Glidden 1989 - Bob