“Gasoline Alley” (*1/2 out of four) was a sordid suspense potboiler about a man (Devon Sawa) under suspicion for the murder of three Hollywood actresses who enlists the help of the two cops (Bruce Willis and Luke Wilson) who have been trailing him to launch his own investigation into the Hollywood underworld and track down the real killer. Sleazy and unpleasant story covers all-too-familiar terrain; Willis sleepwalks his way through his umpteenth paycheck role as a cop but at least Wilson adds some sardonic humor as his partner.