im trying to get it to 71 for the void quest

I'm pretty sure varrock is the best spot if you assume:

 

inability to use advanced firemaking techniques (which can make firemaking pretty much anywhere equally efficient as anywhere else)

uncrowded spot (varrock spot has capacity for about 2 firemakers)

 

teleport to varrock center, firemake west which will bring you to the west bank

Bank, then teleport back to the center. Rinse repeat.

 

if you want a place that is definitely empty, I like nardah.

There's just outside the Edgeville bank, and my favourite spot is in Piscatoris. :D LOTS of room!

FoG is pretty decent, and accommodates 2 people

If you Don't mind Woodcutting your logs, the spot above the crafting guilds pig pen has four willows and a fire line of 27 spaces if you run to the rock northeast of the crafting guild's door.

 

Otherwise, anywhere that has really long unobscured spaces that go west does the job.

If you can eastward light, grandexchange

if You can't eastward light, FOG Lobby.

Nobody ever makes fire lines @ duel arena

I'm pretty sure varrock is the best spot if you assume:

 

inability to use advanced firemaking techniques (which can make firemaking pretty much anywhere equally efficient as anywhere else)

uncrowded spot (varrock spot has capacity for about 2 firemakers)

 

teleport to varrock center, firemake west which will bring you to the west bank

Bank, then teleport back to the center. Rinse repeat.

 

if you want a place that is definitely empty, I like nardah.

The variable is that you can't light a fire inside most banks, so you want a place where you can bank outdoors and minimize running. Oo'glog is pretty good in that respect...it has a few lines and you can light fires in the same square that you bank from. GE is good too, as is the Rogue's Den.

My favorite spot is seers village, just start by the signpost and keep going until you run out of logs and rebank.

I prefer to use the south bank at Ardy. There's a couple things in the way, so you can't quite manage to do an entire inventory in one line, which is why people rarely use it.

I'm pretty sure varrock is the best spot if you assume:

 

inability to use advanced firemaking techniques (which can make firemaking pretty much anywhere equally efficient as anywhere else)

uncrowded spot (varrock spot has capacity for about 2 firemakers)

 

teleport to varrock center, firemake west which will bring you to the west bank

Bank, then teleport back to the center. Rinse repeat.

 

if you want a place that is definitely empty, I like nardah.

The variable is that you can't light a fire inside most banks, so you want a place where you can bank outdoors and minimize running. Oo'glog is pretty good in that respect...it has a few lines and you can light fires in the same square that you bank from. GE is good too, as is the Rogue's Den.

 

 

Though the advantage of Varrock is that you can tele from the west bank, to the center near the fountain, two steps and start burning. By the time you're out of logs, you're standing next to the bank again.

 

This personally is my favorite spot. I got 70 - 75 here. And if i ever get any higher, I'll do it here also.

I got to 92 in Nardah. I loved it because I could do my whole inventory plus an entire yak in one straight line.

i prefer duel arena myself