Not to undermine the validity of your legitimate suggestion (I remember being indignant at this missing feature), but it's fairly easy to estimate delta V without mods. To sum up: Suppose you've got a payload or upper stage with total mass M, easily found via the stock Engineer's Report. Look through the fuel tanks for one or a combination that also have a mass of approximately M. Now find an engine or combination of engines with thrust of M (in tons) * 30 (≈9.81 * 2 * 1.5). Combine them al
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