Quote:
Originally Posted by The Dude
From experience swapping an LS1/T56 combo into my S14 and also having a KA and RB25 in the same car, the mileage does not go up; it goes down.
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what was the vehicle weight before and after the swap?
because that's what really matters.
And of course, you will need to have data logs of the fuel injector duty cycle, fuel pressure, and compare with road speed in real time to know for sure.
Because an engine like an LS-X will use more fuel if you are not setting cruise control and driving at a steady speed for 100% of your calculations. Accelerating, for instance, can eat up a significant amount of fuel since the engine is capable of producing so much more horsepower.