Read the following paragraph and determine if the hypothesis is true:

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.

Available choices:
 +Yes
 +It's impossible to say
 +No
Hypothesis: Diesel fuels have different qualities.


