Per the TH site the DLE 20 is rated for 87-93 octane gas, but the DLE 30 and DLE 55 states only 87 octane. Just spoke to a TH rep who said 87 octane is the recommended fuel for the DLE 20, also. I"ve been using 93 octane, due to the range stated on the site. Does anyone know if 93 octane could \ would cause any damage to the engine over the short or long term? Any advantages of using 93? I'm going to move to 87, since I use the same tank for both the DLE 20 and 30 - just wondering if I'm giving up any performance (like a higher percentage of Nitro), or are these engines designed for 87 and nothing higher? Thanks.