This is a frequent request, but we're probably not going to add a chart for gas prices for a few different reasons. Here's what Matt said
last time this came up:
"We're hesitant to include price in too many metrics because it's not something you have tons of control over. We're trying to highlight the things you can change with behavior -- using a lighter foot will save you money and you'll get farther, but with the fluctuations in fuel prices, we don't want to highlight too many things based on price because the price is almost completely out of driver's control."
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