I bought a 21 Crosstrek Limited the end of April with 28,000 miles, which were mostly from long highway trips. Average milage showed 30.1. And I got good milage in May/June with a mix of city/highway driving. Lately, driving mostly city and in hot weather using the AC, I am getting around 14 mpg!!! The dealer took a look. Said the AUTO Start-Stop was turned off. So they turned it back on. That makes sense, but I am not seeing improvement. I am not ready to accept that 14 mpg is OK, even when the AC is on. Any ideas?