GasBuddy is a huge resource for this type of question
http://www.gasbuddy.com/gb_retail_price_chart.aspx
Sadly, they weren't around back in the 80's and 90's but at least they have a decades worth of data to mine.
I remember seeing diesel go from uber cheap to surpassing the regular gas price. It was $1.69. Really stood out since that was the first I'd seen that. Unfortunately can't recall the year.
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