Great question — answering as the UphillTech team:
He considered it (briefly), but Sally had demonstrated that she trusts him and he was loath to break that trust, especially since he's at the beginning of a mutually flirtatious relationship with her, which is something that he's never encountered before. Once his tank was full, Lightning considered taking off for the open road. Nothing was stopping him now. Sally started toward a mountain in the distance. “Hey, Stickers,” she called. “You comin’ or what?” She drove away, letting Lightning decide for himself whether to make a run for it. After hesitating for just a moment, he took off after Sally. “Mmm-hmm,” Flo said knowingly to Sheriff. “And you thought he was gonna run.” CARS: The Junior...
Full answer by Valorum: https://movies.stackexchange.com/a/122418 (CC BY-SA 4.0).
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