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Curt:

<<winglets not effective in cruise on IV-P...>>

Sorry to burst your balloon, Curt, but the winglets I installed on N934TD were standard issue, and have given me 7 Kts more TAS at 26,000' at same LOP power setting. This means I now get 277 Kts TAS with 15 gph (58% power). Other factors might be Marvel Mystery Oil, (4 oz's @ 10 gallons 100LL), and GamiJectors.
Happy result for me.
Regards,

Tony Durizzi

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