Its great when you can save gas AND have fun.
Not long after upgrading my motorcycle from 36 to 48 volt, a big truck was trailing me closely while going up a big hill.
I decided to accelerate, just to give me some more room. I looked in the mirror about 3 seconds later, expecting him to be just a little further back.
Instead, he was WAY the heck back there.
I totally SMOKED a guy up a hill without using a drop of gasoline!
Now that's fun!