I would have liked to see separate well-to-pump and tank-to-wheel numbers side-by-side specifically for the 2006 Jetta TDI and 2007 Escalade as per your original comparison above that went into the summation for the total WTW number. No need for fancy graphs, just the numbers
2006 Jetta TDI
(Grams/Mile)
Emission..................
WTP.............
PTW................
WTW Total
HC/VOC...................0.029...........0.0194.............0.0484
CO...........................0.053...........0.04................0.093
NOx.........................0.169............0.31................0.479
PM2.5......................0.031...........0.046...............0.077
HC+NOx (US06)........0.198..........0.748................0.946
HC+NOx (SC03)........0.198..........0.748................0.946
CO (US06).................0.053..........0.05.................0.103
CO (SC03).................0.053..........0.05.................0.103
SOx..........................0.086...........0.02................0.106
2007 Cadillac Escalade
(Grams/Mile)
Emission..................
WTP.............
PTW................
WTW Total
HC/VOC...................0.209...........0.067..............0.276
CO...........................0.126...........1.8.................1.93
NOx.........................0.393...........0.02...............0.413
PM2.5......................0.086............0...................0.086
HC+NOx (US06)........0.602..........0.069................0.671
HC+NOx (SC03)........0.602..........0.129................0.731
CO (US06).................0.126..........2.5.................2.63
CO (SC03).................0.126..........2.2.................2.33
SOx..........................0.21............0.006..............0.216
I did make some assumptions in the data...
The certified exhaust PM in PTW is actually total PM (TPM); I assumed it was all PM2.5. I also assumed the PTW PM emissions from the Escalade are zero, although that's almost certainly not the case (all we know from the cert sheet is that it's less than 0.01 g/mi).
Since WTP emission are a function of fuel mileage/consumption, I assumed the mileage was the same in each emission cycle (i.e., FTP75, US06, SC03). This is likely not the case, but I have no data for fuel consumption in the respective test cycles.
I used GREET's default values for PTW (exhaust) for SOx since that value is not given in the certified emissions data.
Great work though! One observation/question: do your/GREET's calculations also take into account evaporative losses while filling-up as well as normal vehicular evap losses?
GREET is *supposed* to account for ALL emissions in the entire WTW cycle, emissions from diesel engines used to pump crude oil out of the ground, emissions from electricity used to refine the crude to gasoline/diesel fuel, emissions from diesel trucks used to transport the fuel to fuel stations, evaporative emissions during storage of the fuel, etc.
I included evaporative emissions from the Escalade based on the CARB certification data. That would include evaporative losses during refuleing (ORVR) plus evap emissions while the vehicle is "sitting", i.e., 3-day/2-day diurnal, and converting those emissions into a grams/mile equivalent.