I have a GT with 19 inch wheels. In my daily commutes over the last 700 mi or so I’ve averaged 4.2. I rarely exceed 70 mph. On a 3000 mi round trip from Seattle to Colorado I averaged 3.7. I traveled at 65 to 85 mph. Over the cars life I’m at 3.9 with 7500 miles on odometer. I admit that I...