If it is a '75, it may be a 36v / 3.5 HP model. Those go about 28 MPH, and have a range of 20 miles or so.
My 1976 48v model goes 35, and would have a 32 mile range with eight 6v batteries. I have six 8v batteries as I prefer less weight, so the maximum range is 24 miles. Went that far once. In general, I use it for 10 or so miles a day.
Upgraded to 72 volts, Citicars have been known to go over 50 MPH, but range will probably never be much more than 30-35 miles until Lithium becomes cheaper than the entire car...
Like that color!