'07 with 21,000 miles. mpg increased this summer to 54, highway. Was 49, a year ago. Using synthetic oil since 3750 miles.
Congrats! And thanks for giving me a bit more hope! I also have a 2007, but I'm not yet at 17,000. The winter was a killer for mileage, but after completing nearly one year, my "lifetime" MPGs are now up to 52.6. If it keeps going this way (like it has for you), then I hope to reach 54/55 by next year! By the way, why not post your MPGs?
