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2013 Ram Laramie 4x4 8 speed 60K miles all stock, most options. Up until my 60K service and tire change a month ago, I easily registered 17-19mpg in town and 19-22 highway (even in 4wd auto). Since then, I've done a 400 mile rt to Houston and at best registered 14-15 mpg. What do I need to check first to fix this? I know the mileage monitors in these trucks are off a bit but still a 5-6 mpg drop seems pretty drastic. Is there a diagnostic to check things out? Any thoughts appreciated. I love this (my first) truck, but now??
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