Carbon Footprint

The difference between car and plane is really big, here are calculates:

From my city  BYDGOSZCZ to PENICHE is 3.200 km is gives 1,36 t CO 2
0.68 t (weight) :    3200 km in average Car which use (LPG) by Nissan Primera P10 1996 y.
http://calculator.carbonfootprint.com/calculator.aspx?tab=4

but when this distance will be by plane from BYDGOSZCZ to LISBON (+ 107km to PENICHE) is gives
0,52 CO 2 (BYDGOSZCZ-LISBONA) and (0,02 CO 2 LISBONA-PENICHE by car)
so it's gives together 0,54 CO 2 this distance.
http://calculator.carbonfootprint.com/calculator.aspx?tab=3