20%
On my 2010 Kia Sportage I get 46 miles to the gallon at 70mph, 52 miles to the gallon on a long run at 55mph and about 40 running about the town. It is lower in winter when the car takes time to warm up and journeys tend to be shorter.
around 2 hours 15 minutes including breaks
34 miles driving at 70mph requires 29.1 minutes.
http://www.wolframalpha.com/input/?i=200+miles+at+70mph
the 2001 Ultra will get 20-22mpg city and27-30 highway at 70mph. Unless you have a heavy foot.
At 50mph just under 10 hours At 60mph just over 8 hours At 70mph just under 7 hours ... and so on.
my 94 club wagon gets +/- 7 in town (460, auto, 3.55 gears) 12-14 highway @ 70mph
50mph x 3.5 hours = 175 miles.
50mph is the equivalent of 80kmh.
About 70 miles per hour.
53 mins
12 hours.