Gday Jarrad
I'd say you'll get between 300-350m of 65lb Tufline on a dogfight spool. I use to get about 250m of 80lb Tufline on my Dogfights. However i have changed to Jerry Brown solid spectra and get the following on the spools. JB 80lb=300m, JB 100lb=270m, JB 130lb=170m.
I find JB thinner and easier to cast then the equivalent tufline classes, with the same knot strength and around the same price. I'd almost say i find JB as good as varivas at a quarter the price. But this is only my opinion from using both lines.
Regards Tony