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Yeah, there's probably too many variables to make a blanket statement about it. I just thought it would be nice to punch in the values, knock 10-15% off, and say "yup, that's about what I'll get" especially for stuff that has no EPA figures, like old stuff or theoretical stuff.
Maybe it would work for each individual, though. Like, I know my environment, and if I show that all my vehicles return 90% of predicted fe for me, in my area, then I can apply that to the old/theoretical for a decent guesstimate.
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