Hello Plankman,

Yes, you can run 20% on the 175, but with lower Nitro the CDI will increase the reliability, also and to agree with Cris, all engines running CoolPower will look like new on the inside with 300+ flights, the CDI gives about 20% more flying time compared to Glow.

The CDI eliminates the backfiring problems of the glow version, so you will be saving close to $100 in a delayed glow driver.

I ran Wildcat YS20/20 years ago, before I changed from the 120AC. I ran PowerMaster for years on the 160 and up, awesome fuel, as good as Morgan's. Also used Byrons Gen @ in competition and ran as well as the other two, but cannot tell about long term use.

Regards