to its low price and fuel economy. By 1974, the Vega was among the top 10 best-selling American-made cars, but the aluminum-block engine developed a questionable reputation. Chevrolet increased the engine warranty to to all Vega owners, which proved costly for Chevrolet. The 1976 Vega had extensive engine and body durability improvements and a five-year/ engine warranty. After a three-year sales decline, the Vega and its aluminium engine were discontinued at the end of the 1977 model year. Pontiac's cheapest car was a re-badged Vega variant exclusively available in Canada for the 1973-74 model years, and introduced in the U.S. the following year. The final 1977 models featured the first use of Pontiac's Iron Duke inline-4 engine. Lower priced versions of the Chevrolet Monza were introduced for 1978 and rebadged variants of the discontinued Vega were also added to the Monza line - the Monza wagon using the Vega Kammback body was sold for the 1978-79 model years, and the Monza S hatchback, a price leader model using the Vega Hatchback body, was also offered for the 1978 model year. The Ford Pinto was introduced one day after the Vega. It was small, economical, and a top seller. Controversy over the design of the fuel system and a Ford cost benefit analysis presented to the public as specific to the Pinto destroyed the reputation of the car. The Ford Pinto engine though was successful in European Fords for twenty years, in successive mid and large European sized mainstay models of the; UK Ford Cortina, German Ford Taunus, the Ford Sierra, and the Ford Granada amongst others. By 1970, Nissan released their first front-wheel-drive car that was originally developed by Prince Motor Company which had merged with Nissan in 1966. This was introduced in 1970 as the Datsun/Nissan Cherry. In 1973, the Energy Crisis started, which made small fuel efficient cars more desirable, and the North American driver began exchanging their large cars for the smaller, imported compacts that cost less to fill up and were inexpensive to maintain. The Toyota Corona, the Datsun 510, the Mitsubishi Galant (a captive import from Chrysler sold as the Dodge Colt), the Subaru DL, and later the Honda Accord gave buyers increased passenger space and some luxury amenities, such as air conditioning, power steering, AM-FM radios, and even power windows and central locking without increasing the price of the vehicle. In 1972, the Honda