Finally, context may be of some help, but "test" is ambiguous between a noun and verb, and "gasolines" is only seen once in the training data, so there is no guarantee that context is sufficient to make a correct judgment.
some of the other contexts in which "reformulated" appears in the test set, such as "testing of reformulated gasolines," provide strong evidence that it can start a NP, since "of" is a highly reliable indicator that a NP is to follow.