Only way to get a range calculator is through HTC because they have all the data for each plane's fuel consumption for any given alt,manifold pressure, and rpm etcc. as each plane is different. Actually the only way I could make this calculator u ask for is fly every single plane and right it down for every situation like ord, fuel load, wind, rpm setting, manifold setting and altitude. Hate to tell u this, it not gonna happen anytime soon,lol.