Final answer:
The statement is an example of the fallacy of denying the consequent.
Step-by-step explanation:
The statement 'SUVs get terrible gas mileage. Doug decided not to buy an SUV, so he gets excellent gas mileage' is an example of the fallacy of denying the consequent.
This fallacy occurs when someone assumes that if a certain condition is not met, then the opposite condition must be true.
In this case, the person assumes that since Doug chose not to buy an SUV, he must get excellent gas mileage, which may not necessarily be true.