Given the obscenely high fuel values of plasmas, trying to squeeze the most fuel efficiency out of them hardly seems necessary. However, extra nether stars and osmium cost vs. replacing turbine items every so often. Tough call. I suppose it's a bit early for me to decide, at least in regards to plasma, since I haven't actually sourced osmium in my current survival world, let alone built a fusion reactor. Slight tangent: does anybody think large turbines are worthwhile for biogas? Single-block gas turbines don't require nether stars or osmium.
Not once Diesel Engines are a thing