Because people tend to think of their cars when determining how much they cost to operate and the numbers simply don’t make sense when applied to a plane.
Consider: if a tank of fuel costs around $100 (depending on make and model and currency and location of course) if you can drive 500 km over 5 hours that’s 100km per hour at $20 of fuel per hour.
Then figure about 20,000 gal/hour fuel consumption on an F-15 (not the maximum flow) and a NORMAL price of **$3.00/gal** of JP 5. That’s $60,000 for an hour of flight. * not my numbers – I don’t know the source, I’m a little shocked by these figures too.
Then consider that you didn’t figure in the cost of your *time* (give yourself a decent salary), your car, the oil, the maintenance, the time your car is just sitting in your driveway, the R&D, cost of manufacturing, etc into your $20 per hour, and you can kind of see how the costs balloon rapidly when you start to add all these things up.
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