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I've seen it happen. Mom's van takes a big hit in winter, even when I started it up and then went after its revs went down when it was a cold start recently the MPGs I got in it were just 18. I can get over 28 when it's already hot on a summer day in near the same trip. And when Mom's driving it, the van can go down to 13 since she idles it to get it warm. And that's after I changed the oil to Full Synthetic Pennzoil Platinum 0w20 - it was getting 10-11 in other years.
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