Here is my modifications. Small/Large Furnaces work how I intend. small.oil.refinery isn't, working like vanilla speed. Also for some reason both bbq, and campfire produce 1 burnt each tick cycle though working vanilla speed.

{
"Use Permission": true,
"Speed Multipliers": {
"global": 1.0,
"furnace": 50.0,
"furnace.large": 100.0,
"small.oil.refinery": 100.0
},
"Fuel Usage Speed Multipliers": {
"global": 1.0,
"furnace.shortname": 1.0
},