Ajouter une intrigue dans votre langueInventor Al Simpkins develops a new airplane fuel, "Economo," which he claims gets a thousand miles to the pint.Inventor Al Simpkins develops a new airplane fuel, "Economo," which he claims gets a thousand miles to the pint.Inventor Al Simpkins develops a new airplane fuel, "Economo," which he claims gets a thousand miles to the pint.