I was looking yesterday at a post. fuel was specified in the tags. The question was about diesel, so I tried to add the tag, only to realize that diesel and fuel are set as synonyms. I clicked on the tag to see the related questions and started looking through them. I can tell you from the variety of questions, this should not be a tag synonym. There are a 128 questions which cover everything, but only a small portion of them are diesel related. Looking at them just now, there are three tags which flow into fuel, those being gas, petrol, diesel. IMHO, this really should not be. If I were to have been setting this up, the following would hold true:
- petrol and gas would be synonyms, covering petrol/gas engine related items
- diesel would be its own tag, covering all things related to diesel engine tech
- fuel would be its own tag, covering all thing related to fuel delivery
To me these are very different things. I think a perusal through the questions will tell you there is way too many questions lumped into fuel which really doesn't make sense being there.
Just so you know I looked, there was this question posted here in the Meta where I think this all started. It was asked very early on in the Beta. I believe the outcome was a bit short sighted.