I started at 5knts, wnt down to 1knt, each trying the max speed with the nav officer. 3 knts was the longest range, stranglely 2 and 1 knot was shorter range. Wierd.

yea thats what i mean--lower speed=less range...? thats what I've been seeing--I guess that kind of makes sense what the other guys said above about not getting very far with the fuel at low speeds, but then again shouldn't the low fuel consumption rate give you some more km in range? whatever I was just wondering if anyone else noticed it ... cool I am not alone..so my game is still relatively bug free even after all of these mods!

Ahead slow will always get you further than 1/3 or more. The navigators distance estimations will verify that.

There's some math involved (which means I can't explain it very well:p).

This old 4X game Stars! illustrated it pretty well. Sometimes going faster consumed less fuel than going slower.

I don't think it's a bug, just the math of things, reduced fuel consumption somehow cancelled out by longer time to reach your destination.