Nor will it work to compare expenses over various parts of the country. I
think it's more accurate to use it to compare one aircraft to another at the
same location at the same time period, then allow the "x" factor to be a
variable for that time and location only. You still must keep in mind that
it is only a ballpark figure. All other things considered equal,
maintenance and insurance for an A36 would probably be more than for a C182
although they burn about the same amount of fuel. Let's just say that
without any additional info, it's a place to start.
Jim

"Mike Granby" wrote in message
ups.com...

Yes, av fuel has doubled, but as energy price
go up so does everything else with short order.

Sorry, but this is nonsense. 'Everything else' has self-evidently NOT
doubled in price over the last few years. Any rule of thumb that
estimates overall costs as a multiple of fuel costs cannot be both
right now, and have been right five years ago.