Retail Diesel and Heating Oil spread

The top chart shows the difference in Retail Diesel prices less Heating Oil Futures. The 60 mo moving average is moving higher currently at 1.25 vs the current spread at 1.88. From 2015 to 2020 the MA for the spread was about 1.00. The accelerated rate of change is very noticeable in recent years. Will the expansion of Renewable Diesel help or hurt this spread?
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