Diminishing MPG's

I've never been into attempting fabulous mileage figures, but I've always gotten 48+ in freeway driving w/ my 2011 IV. However, the last 2 freeway trips I've taken have netted me around 36 MPG's & I can't figure out anything that I'm doing differently. Around town there doesn't seem to be a problem, but the freeway is a major issue. My last oil change was a few weeks ago & the Toyota dealer cleaned a filter & said that should do the trick, but it certainly didn't. I'm hoping to find some suggestions that I can take to the dealer in order to find what's going on w/ my car. By the way, I'm in Florida so cold weather isn't the issue.


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