Does the weight of aircraft affect fuel efficiency

just wanted to see the heavier you are with passengers and cargo, can affect your ability to travel long distance. id think so because you can go higher altitudes but i just wanted to ask to make sure

More weight means that the aircraft’s engines have to increase power output to maintain the same flight profile as a lighter aircraft hence more fuel burn, so yes, the heavier the plane, the more fuel it needs.

Another reason would be since a heavier aircraft would cruise at a lower altitude, it would be exposed to more aerodynamic drag than a plane cruising above it hence fuel burn increases. This is prominent on long haul flights where step-climbing is used.

Info about step-climbing:


Yes it does. Less thrust will be required the lighter you are and the bigger range for altitudes means you can cruise higher with even more efficiency.

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