I am not seeing a problem with the exported file. Here is an example of the first three lines of your exported file, can you point out the problem? The l/100km is 0 because of your partial fuelups. The export appears to match your fuelup log.
Code:
car_name, model, l/100km, odometer, km, litres, price, city_percentage, fuelup_date, date_added, tags, notes, missed_fuelup, partial_fuelup, latitude, longitude
"Renault Laguna 2.2dT","Renault Laguna",0.00,200124.0,22.00,5.35,2.560,100,2014-06-22,2014-06-22 13:12:58,"eko","After Mramor, this time really to pped up",0,0,,
"Renault Laguna 2.2dT","Renault Laguna",0.00,200102.0,82.99,57.54,2.550,100,2014-06-22,2014-06-22 09:15:21,"eko","Еко вапцаров, тръгвам за преглед в мрамор, спира зареждане непълен резервоар",0,1,,
"Renault Laguna 2.2dT","Renault Laguna",0.00,200019.0,77.01,7.84,2.550,100,2014-06-19,2014-06-19 12:53:33,"eko","Eko on Константин величков",0,1,,
dkaparis 
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