I design a survey ship with 3 basic life supports, 3 impulse engines, and a survey module -- it's range is 2.8. However the range of the design changes to just 1.6 if carried over from a game to a new game.
Same thing happens with a colony ship design that has 2 impulse engines and 2 basic life supports. changing from 2.0 range to 1.2 range.
These changes are real; I've made 1 ship of carried over design and 1 with a new design -- their ranges are significantly different as the range in their descriptions would indicate.