As Ellie has said, you are looking at this the wrong way around.
A 0.9 resistance coil could need 80w just as a 0.1 could. It's all down to the amount of metal you are attempting to heat up. Small coils, 80w would melt, huge chunky exotic dual coils, 80w wouldn't even began to heat up.
Metal type also makes a difference. Ni80 for example heats up quicker than say SS so would require less power to achieve the same type of vape.
I'd start simple with your coil and build up from there. Stick a build in then start at 25w moving up in 5w increments until you find a wattage level that particular coil works at.