not quite a complete picture, but very interesting all the same.
green looks like 265gm/kwh and red is ~294 @ 1800rpm
I wouldn't be suprised if there were more efficiency at a higher rpm with a little more than %25 throttle, but yah, pulls are $$$
I don't have the brain cells to turn it into a bsfc map at the moment though. Part of the issue is that tps isn't load, but is a function of rpm and load.
Do you have more detailed data in table format by any chance?
edit: I think this is the sort of reasonable first step anyway based on the graph, not exactly sure how to translate to load instead of tps, some rpm based scaling and interpolation I guess.
Code:
re-expressed as tps/rpm in gm/kwh
50
45
40 285 280 282 276 278
35
30
25 272 266 265 269 275
20 272 270 271 278 285
15 288 289 294 308 324
10
1400 1600 1800 2000 2200