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Old 01-15-2016, 01:08 AM   #4 (permalink)
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How long have your trips been? Short trips don't always allow the engine to heat up fully, which is required for the engine to turn off (I'm not familiar with the exact conditions required for the Highlander). The engine also doesn't run as efficiently as it could while it's warming up. Longer trips help to average away the initial poor mileage from a cold start. Maximizing the length of your trips by combining grocery shopping trips with other errands will keep the engine warmer overall, even if it'll be off 20-30 minutes while you conduct your business. My Prius usually loses a few MPGs if I'm mainly making short trips, especially when it's cool out.

130 miles isn't very far. I would wait until you go through a few tanks before assuming the worst. Something easy that you can do in the meantime is check the tire pressure and make sure it's at least what the sticker on the door jamb specifies.
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