Using the below formula, if you consume 100Kg of fuel on a 2000 Metric Ton vehicle, you end up traveling
.049 kps. This doesn’t seem to make sense. What am I doing wrong, or what is missing here? Is the exaust velocity an order of magnitude (or so) slow?

Jolly Roger wrote:

The maximum speed of the ship is not limited by the exhaust velocity as the action is relative… The speed limitation is mainly one of fuel, the ship will keep accelerating forever with infinite fuel and time, however as you approach the speed of light the net acceleration drops significantly as the relative mass increases.

My Bad! Thank you. I stand corrected. I was assuming that the equation for final velocity was:

Vf = Ve,

where Vf is the final velocity and Ve is the exhaust velocity.

The correct equation is:

Vf = Ve * ln(Mi/Mf)

where ln is the natural log, Mi is the initial mass of the ship, and Mf is the final mass.

I will do some calculations with various mass ratios and post my results later.