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Only things that effect that chart is BSFC map. On TDI engines the average is around same
200g/kWh
Fuel density
0.85 kg/l
Engine power average estimation
40 kW
200*40 8000 g/h
8/0,85 9,41 l/h 0,002613889 l/s
on idle your fuel consumption is 0.5 l/h =0,000138 l/s
Then just calculate how many percentages you are on flat out near 2000 RPM and how much you are gliding.
Because your 1.9 TDI has 81 Kw vs 40 Kw it consumes double the fuel at same P&G times...
Lighter vehicle is not a big factor in the big picture the Cd value means the most when you are gliding in neutral at 80-90 km/h speeds. Ofcourse the bigger car has more energy storeged in itself but that takes also more energy to accelerate it back in push.
Was I clear enough?
I can send the exel sheet in email if someone wants to use it as well just send me private message...
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