Just got home last night from a trip to N. GA. Total of 1435 miles, average of 24.3 mpg at an average speed of 80+ The big hills in NE GA were the only thing that slowed me down. Also the only time I saw any smoke from the tail. Another thing I noticed is the fuel I bought in Ga seems to be better in quality than the FL stuff. I got better fuel economy, more power, etc. Color was also different. FL fuel from the Flying J's is a light green color, GA fuel from the same stations was a light amber color. Don't know if this is a winter vs summer blend, or a state air quality thing but I got 26+ mpg in GA and a little less than 23 running in Florida.