Originally Posted by
RatherBeFlying
Post WWII most piston airliners were certified on 115/145.
On 100LL derates have to be applied. Engine out performance on 100LL will be less than on 115/145.
Not exactly true. The R2800 CB16 engine was certified on 100/130 for which 100LL is an approved alternate with no reduction in power. the CB17 was certified on 115/145 and would develop an additional 100 HP The Convair 340 may have had several different model engines installed, including the CB16 and CB17