Avion was a small American efficiency-car venture created by Craig Henderson and Bill Green in Bellingham, Washington, in the mid-1980s. The pair completed the Avion prototype in 1984 as a lightweight, highly streamlined two-seat sports car using a small diesel engine and composite/aluminum construction. In 1986 the car set a Guinness-recognized border-to-border fuel-economy record of about 103.7 mpg on a Mexico-to-Canada run. After years out of…