All of this looks well and good on paper. In practice, no speaker is going to triple or even double your volume. Some speakers are more efficient than others yes. You also have to look at the frequency response curves. You will also find that the more power a speaker can handle, the less efficient it usually is. This is because the individual components are more massive and there is more heat loss. It isn't a simple relationship.
Stage Guitars: '80s Thin line LP Custom, '70 LP Standard, '83 Squier Black Headstock Strat w/ Dan Torres pickups, '59 Black Danelectro DC, sometimes others.
Pedal Board: Nady UHF 10 -> TU2 -> Rocktron Big Crush -> 70s MXR Phase 100 -> Cry Baby -> Bad Monkey -> Early '80s Rat -> Early '80s Ibanez CS 9 -> Ibanez DE 7 -> Behringer Dr 100 Stereo Reverb
Stage amps: '63 Blonde Tremolux w/ two original 2X10 cabinets with a '60 Ampeg Rocket/18 watt VTB Marshall clone/ Epi VJ into a Mashall 1965A