Bucking a moderate 10 mph wind on the way there. With neutra in the tank.
477 miles
22.2 mpg
avg speed 62.1
On the way back no neutra with a 15-20 tail wind.
485 miles
24.5 mpg
avg speed 59.2
The avg speed affected by a couple more stops and a 20-30 minute 5-10 mph construction hang-up.( or the diff in mpg would be even greater)
Needless to say this turned out to be a mpg wind test.