Postby smj999smj » Mon Feb 22, 2016 8:14 am
You can use regular unleaded and it'll be just find. I've noticed no mileage gain or noticeable performance gain between using premium or regular unleaded on my 2006 LE or 2008 SE. My combined average for my 2006 is 17.5 MPG and 18.5 MPG for my 2008. I find I get the best mileage if I use cruise control whenever possible.
You numbers are right around where they should be. I get 16 when I'm doing a lot of around town driving and 21-22 on interstate runs. Per FuelEconomy.gov, the 2012 V6 is rated at 14 city/16 combined/20 highway.