Emma Reynolds pulled up to the Kroger gas station in Donelson, popped the gas cap on her SUV and climbed out. She calmed a fussy toddler in the back seat, then pulled out her wallet. “What isn’t expensive these days?” she asked as the ticker on the pump clicked up from $10, to $15 and $30. Reynolds and her family have a couple of weekend trips planned this summer. One to Mam…

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