Definition of «poorer fuel»

The phrase "poorer fuel" means fuel that is not of very good quality or is not very effective in making something work efficiently.

The owner is complaining of poor fuel economy as well. (mechanics.stackexchange.com)
There are a number of things that can cause poor fuel mileage. (yourmechanic.com)
The switch may have failed if the car gets poor fuel economy. (yourmechanic.com)
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