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Extending Your Fuel Efficiency

** The best way to stretch fuel is to slow down.
It can be a case of diminishing returns, but
sometimes a few extra miles means a lot.**
Gemini Sparkle

Key Takeaways:

  • Pilots may occasionally need to extend their aircraft's range due to unforeseen factors like strong headwinds or inadequate initial planning, making an immediate fuel stop impractical.
  • The most effective strategies for increasing range involve optimizing speed by flying at or near the "best-range speed" (approximately 40-50% above clean stalling speed) and aggressively leaning the fuel mixture.
  • Additional range-extending measures include selecting an altitude with minimal headwind and reducing propeller RPM; however, these methods offer limited overall gains (maximum one-third additional range), emphasizing the critical importance of thorough flight planning.
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It ought not to be true, but it is: In every pilot’s life there comes a moment when he wishes he had a little more fuel.

Perhaps the headwind was stronger than forecast; the gauges have dropped below a quarter sooner than you hoped they would; the descent and climb for an en route stop to drop off a passenger used up more fuel than you expected; you took a detour around weather; or your planning was careless in the first place. Whatever the reason, you find yourself in that awkward spot: a certain distance from your destination, with a certain amount of fuel and with a nagging worry about where those needles will be pointing when you arrive.

Peter Garrison

Peter Garrison taught himself to use a slide rule and tin snips, built an airplane in his backyard, and flew it to Japan. He began contributing to FLYING in 1968, and he continues to share his columns, ""Technicalities"" and ""Aftermath,"" with FLYING readers.

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