I think it should do

+25% more damage

big airblast but you lose 50% of your ammo

start with 150 ammo

just an idea, but...
+airblast size increased
+10%dmg
-airblast recharge time increased (is that a thing?)
- ammo used faster for flames

Just an idea, again, please let me know if too op :)

my idea
+ 15 percent extra damage
+ 10 percent afterburn damage
+ 50 percent more ammo
- Airblast 50% weaker
- 30 percent afterurn timer
- 15 percent more damage taken to fire while deployed

Idea 1:
- +50% ammo consumed
- +150% ammo consumed when airblasted
- +50% larger ammo capacity
- Airblasts have larger push force and larger area of pushing

Idea 2:
- 25% increased damage
- 50% faster ammo cunsumption
No airblast, but both spouts can be controled indepentently. When only left side used, flames go more left (same for right). When both used, larger range and increased damage BUT goes through ammo twice as fast

this thing looks badass :D i hope it gets put into the game

+ 50% more damage (oh my god i'm on fire!)
+ small knockback

- no airblast
- 100% more ammo consumation (doubled)

Originally posted by Fishron:

Idea 1:
- +50% ammo consumed
- +150% ammo consumed when airblasted
- +50% larger ammo capacity
- Airblasts have larger push force and larger area of pushing

Idea 2:
- 25% increased damage
- 50% faster ammo cunsumption
No airblast, but both spouts can be controled indepentently. When only left side used, flames go more left (same for right). When both used, larger range and increased damage BUT goes through ammo twice as fast

Kinda like this idea, apart from the no airblasts... maybe reload could be a toggle for switching between only airblasts (more powerful, more ammo consumed), and your idea?

Pro:
Double+Faster Airblast
Double flame
Airblast no ammo required

Con: minus 100 primary health

LOL

+45% Ammo Consumption
+15% Damage
On kill, enemies have a 75% chance to drop a gas tank which will refill your ammo.
However, enemies can kill you by exploding gas tanks.

Here’s my suggestion for stats, perfect for what the Pyro is unmatched in; hit and runs:

+ Afterburn deals 2% of target’s current max health as damage per half second
+ Airblast is constant stream as primary fire is but at twice rate of ammo cost
— -50% damage penalty

Here’s a graph to show the first mechanic, keeping in mind that all damage in TF2 is rounded up

Current Max Health of Ignited Enemy (h) ---- Afterburn Damage per Half Second for 10 seconds

50 < h ≤ 100 ------------------------------------------- 2
100 < h ≤ 150 ------------------------------------------ 3
150 < h ≤ 200 ------------------------------------------ 4
200 < h ≤ 250 ------------------------------------------ 5
250 < h ≤ 300 ------------------------------------------ 6

idea#1
pros
+20% more damage
+15% stronger airblast
+15% more primary ammo
+1% more chance of mini crits

Neutral
on kill: enemy turns to ash
on crit roar sound plays
airblast launches the player upward
Cons
-13% explosive damage
Airblast take 15% more ammo
-while deployed 13.5% slower healing by medics or dispensers

my idea!
+double damage. because 2 flamethrowers?
airblast cost also doubles. to 40 per airblast.
it consumes ammo TWICE as fast.
airblast is also twice as powerful. 2 flamethrowers and yeah...
everything is doubled! lol. this should do.

+100% more damage
+Airblast pushes the target twice as far and increases the speed of projectiles reflected
-Consumes twice as much ammo when in use
-Consumes twice as much ammo when airblasting
-No random Critical Hits

i think it would have double damage, but less ammo capacity and/or higher ammo consumption, but i dont know about airblast.