Yes, much too thirsty.
Take the Jumper Stealth:
4x 0.8 power engines and 100HS fuel fits on the same tonnage, has the same speed, uses 18% as much fuel, and has several times the range.
4x1.2 power engines and 100HS fuel has slightly more range than the original, uses 49% as much fuel, and is 50% faster.
Overstressed engines compensated by excessive fuel load is the easiest way to ruin a design. Even if you want the design to refuel others, it's too much.