Boosting Your Fuel Efficiency When You Reach C: The Impact of Mass Increase

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DARKSYDE
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when approaching C the mass of your craft increases. If the mass of your fuel increases also wouldn't that mean the faster you go the more fuel youll have?
 
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No.

Observers inside the spacecraft will not observe any relativistic mass increase of the craft or its fuel.
 
DARKSYDE said:
when approaching C the mass of your craft increases. If the mass of your fuel increases also wouldn't that mean the faster you go the more fuel youll have?
No, relativistic mass is the same as total energy. Since some of the fuel's total energy goes into the exhaust the total energy of the fuel must decrease, not increase.