The fuel technology factor is defined as the difference in engine efficiency for both fuel types.
- target efficiency for petrol engine: (1/0.220*3.6)/39.55 = 0.41375
- target efficiency for diesel engine: (1/0.195*3.6)/42.31 = 0.43634
- fuel technology factor: 0.43634/0.41375 = (0.220/0.195)*(39.55/42.31) = 1.055
This factor explains why petrol engines get a 5.5% more energy allocated per lap than diesel engines: 148/1.055 = 140.3.
The k technology factor seems to be calculated as followed:
- no ERS
- petrol allocation: 148 MJ/lap
- diesel allocation: 140.3 MJ/lap
- k technology factor: (148/140.3)/1.055 = 1
- 2 MJ ERS
- petrol allocation: 143.5 MJ/lap
- diesel allocation: 138.4 MJ/lap
- k technology factor: (143.5/138.4)/1.055 = 0.983
- 4 MJ ERS
- petrol allocation: 139 MJ/lap
- diesel allocation: 134 MJ/lap
- k technology factor: (139/134)/1.055 = 0.983
- 6 MJ ERS
- petrol allocation: 134.5 MJ/lap
- diesel allocation: 129.7 MJ/lap
- k technology factor: (134.5/129.7)/1.055 = 0.983
- 8 MJ ERS
- petrol allocation: 132.2 MJ/lap
- diesel allocation: 125.4 MJ/lap
- k technology factor: (132.2/125.4)/1.055 = 1
So the k factor is an additional correction factor. The motivation for this factor is unclear to me.