The International LoneStar (also stylized as International Lonestar) is a model line of conventional-cab trucks produced by Navistar International since the 2009 model year. The flagship model line of the company, the LoneStar is marketed as its largest on-highway truck, slotted above the International LT (formerly the International ProStar). Unveiled at the 2008 Chicago Auto Show, the Lonestar is the largest road vehicle ever introduced at the event. Sharing its Next-Generation Vehicle (NGV) cab with the LT/ProStar, the Lonestar is a semitractor configured primarily for highway applications. Through special order, the model line is also offered for certain vocational applications, including heavy-duty towing or dump truck use. At the time of its launch, the Lonestar was assembled by Navistar in Chatham, Ontario. Following the 2009 closure of the facility, Navistar shifted assembly of the Lonestar to its facilities in Springfield, Ohio and Escobedo, Mexico, produced alongside the Prostar, Transtar, Durastar, and Workstar. Background According to Navistar, the Lonestar was developed to create an "Advanced Classic" truck, mating the design elements of vehicles from the past with 21st-century technology and aerodynamics; the company cited its primary design influence as the late-1930s International Harvester D-series As a large extended-hood conventional, the Lonestar also was similar to the classic-style International 9900ix and its competitors, featuring a large grille and bumper, external air filter containers, vertical-mount exhaust (with all of the above trimmed in chrome). The final model of the NGV series to enter production, the Lonestar was developed in only 24 months from beginning to end; following its initial development on computers and clay models, the company shifted directly to production (bypassing the assembly of traditional prototypes). In line with the more contemporary design of the International Prostar, the exterior of the Lonestar was aerodynamically optimized. In comparison to the 9000-series and similar trucks, the Lonestar was projected to increase its fuel economy by up to 15%. While priced as a premium vehicle, the Lonestar was developed as a vehicle for both owner-operators and large fleets, with Navistar citing that a large proportion of classic-style trucks owned by fleets are operated by larger fleets of over 25 vehicles. Design overview Of the International NGV series of trucks, the Lonestar is most closely related to the Prostar; both developed for long-distance highway applications, the two vehicles share a common cab structure. The Lonestar is produced with a set-forward front axle and an extended hoodline;