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What a Piston Twin Really Costs to Own and Fly
COST OF OWNERSHIP The purchase prices look like bargains. They are bargains for a reason: everything that costs money on a single, a twin has two of — and a few things singles do not have at all.
Piston twins are the classic value trap in aviation: a Baron, a 310, or a pressurized 340 can sell for less than a newer high-performance single, and the buyer concludes the twin is the better deal. The airplane may well be the right choice — real speed, real payload, real weather capability, a second engine over water and at night. But the operating math is a different sport, and it is worth doing honestly before the wire transfer, not after the first annual.
Fuel and the second-engine tax
A twin in this class burns 22–32 gallons per hour in cruise. At mid-$6 avgas, fuel alone is $145–$210 an hour. That is the visible part of the second-engine tax. The invisible part is the reserves: two engines, each with an overhaul in the $45,000–$70,000 range against TBOs around 1,400–2,000 hours, means an honest engine reserve of $50–$90 per hour — plus two propellers accruing toward their own overhauls. On a pressurized, turbocharged twin like a 340, run those numbers at the high end.
Maintenance: more than double, not just double
Twins carry systems singles do not: a second full engine installation, crossfeed fuel plumbing, more complex landing gear, deice boots, and on the cabin-class airplanes, pressurization. A realistic maintenance accrual runs $100–$160 per hour, and annuals on a cabin-class twin routinely land in the $8,000–$20,000 range even without surprises. On airframes of this age the surprises are the point — which is why the records matter as much as the compressions. Start with the pre-buy fundamentals and a proper title search.
Insurance and the pilot factor
Twin insurance is priced on the pilot as much as the airplane. A current, instrument-rated pilot with meaningful multi time might see $6,000–$15,000 a year; a low-time multi pilot stepping up to a pressurized twin can see quotes well above that, or demands for extensive dual before solo coverage. Add hangar for a bigger airframe and the fixed base runs $15,000–$30,000 a year before flying.
The honest totals
All-in, a straightforward twin flown 100–150 hours a year typically costs $350–$550 per hour; a pressurized cabin-class twin runs $450–$700. Against that, the twin delivers 180–220 knots, six seats, and dispatch capability a single cannot match. Whether that trade is worth it depends entirely on your missions — which is a question you can now answer with data instead of hangar talk.
Put a real trip through the math: PlaneLists.com EDGE™ builds the full hourly cost for a twin — both engine reserves, props, maintenance, fuel, fixed costs — and compares a specific trip door-to-door against the airline, using actual DOT fares and BTS delay statistics. It will tell you honestly when the twin wins and when it does not.
Run your mission through EDGE → See twin asking prices by model
Current market context helps too: our market pages track asking prices by model from live listings, and the For Sale map shows which twins are actually on the market today.
Related: What a piston single really costs · 5 things to check before buying · Form 337s and damage history
Figures are planning estimates for typical aircraft in this class, not quotes. Engine times, pressurization, and insurance profile move these numbers substantially. This is general information, not financial advice.