Yes, in today's world it is still possible to travel over 200 miles on a single gallon of gasoline.
My trip took me from downtown Portland Oregon, into Astoria Oregon, then Seaside, down to Tillamook, and then back into Portland. To get an idea of my average speed, the Portland to Astoria leg took roughly 4 hours...and I pedaled the entire way
My Bike & the route:
View Larger Map