Foreflight, True Airspeed, and Altitude

[211º]

I have a few profiles set up in Foreflight for my 20E. Right now, they are based on ROP, LOP, and/or book numbers.

While hangar flying and looking at the differences in winds, I wondered about using a low-altitude (3,000') profile, a mid-altitude (say 7,000) profile, and a high altitude (11,000') profile.

I think (but am not certain) that FF uses TAS to calculate time en route and fuel burned - so if at all three altitudes I flew an IAS of (say) 150mph, I'd use 159mph (106%) for 3000', 171mph (114%) for 7,000', and 183mph (122%) for 11,000 feet.

I'd do this to be able to quickly change the altitude and profile to see what kind of difference there would be to total fuel and time en route - I realize that this might save only 10 minutes and a few gallons on a 400sm flight, but I'd just like to solve (or hear other's opinions).

- Dave (Cincinnati Lunken)