And it still sounds like an electric.

War birds don't hum or whine, they roar.

You also don't have to get a Saito, which we all know tend to be expensive. Go with a small gasser for $199 or so, and it becomes a LOT cheaper and even better sounding than the Saito.
I know my Moki powered H9 P-51 easily got 15 minute flights and that was with Glow. I usually landed with a little less than 1/4 of a tank when I was up for 15 minutes. If I had gone gas, it would have been a lot longer flights and a lot more gas left in the can.

That being said, the CMP Bf109 is a bit small for me, I build bigger. Electrics just can't do large scale as well as gas can.