R3T-Too
Supercharged
As speeds increase forces increase in an exponential manner, so MPG will drop sharply as MPH increase. I get about 40-45 ish cruising at 70mph, but around town it's terrible, like 20-25 depending on how much I play on a given tank of gas.
For a long roadtrip I see no reason I couldn't get 200 miles per tank, and that equates to around 3 hours between fill-ups. By that time I am ready for a break, physically and mentally so it works out well imho. I would hate to have a 5 hour endurance per tank, then I feel like I'm quitting and breaking before I should need to.
I usually run between 75 & 80 on my commute with a few extra twists of the wrist and usually refuel Mondays and Thursdays.
Long road trips around here will put you in a lot of 75 mph zones. At those speeds I get around 30 mpg X 5 gallon refuel interval which gives me about 150 miles per tank or a little over 2 hours.
I'm really surprised at the disparity of MPG between the big barn door that's my Voyager & my Rocket @ highway speeds.
I used to chalk it up to higher RPMs at those speeds, but maybe that barn door cuts through the wind a little better than I thought.