Sorry I didn?t answer your cruise question.
I get about 128 MPH on 8.4 GPH at 3500? MSL (3000 MSL is just 100? to 200? AGL where I fly).
My best speed comes at about 12,500? DA ? 142 MPH on 7/8 GPH. At 17,800? DA (service ceiling) the speed is back down to about 130 MPH.
