Yeah, I agree we have some room for improvement here. First, take a look at our FAQ about engine abbreviations:
What do the engine type abbreviations such as L4 and V6 mean?
We don't want to get into parsing the various trim levels of different models. Trim designations for many models can be more marketing than meaningful, and we're trying to keep things very simple. Here's more of our thinking on keeping things simple:
Why don't you track more vehicle details?
As for the HF owner confusion, yeah, that's going to happen in a system where users report their own data. Sometimes people will get it wrong. We can't have 100% accuracy so we have to live with some things like this. That doesn't mean we can't be continually working to make things more clear for people. We are thinking about these issues.
ghammerly 
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