How to drive a turbo diesel car with manual transmission efficiently<br>Choose the right gas station to trial and stick with it for duration of the steps below. Not all diesel fuels are equal quality. Some are " dirtier " than others, and will negatively affect your mileage.
Some gases are dirtier than others. 
( z1 have-degree :ARG1 ( z2 gas :mod ( z3 some ) ) :ARG2 ( z4 dirt ) :ARG3 ( z5 more ) :ARG4 ( z6 gas :mod ( z7 other ) ) )