If I go over to the "mainland" and to the "sad luck Chevron," Top Tier Gas (TTG) 91 AKI was $3.454/gallon on March 2nd. That's after blending 1/3 87 AKI and 2/3's 93 AKI to make "Auto's Custom Blend 91 AKI." 87 AKI was $2.929 gallon. 93 AKI was $3.729/gallon. Prices have gone up about $0.25/gallon since then.

It's the "sad luck" Chevron because:

1. It was wiped out by the 2018 CAT 5 hurricane.

2. It's a small station, with only four double gas pumps.

3. The convenience store is very small.

4. It has to compete with Sam's Club and a new generic, mega gas station nearby.

The sad luck Chevron is owned by a big chain. So, they can afford for that particular station to sell gas at a loss.

I suspect that California's emission requirements are causing less diesel to be used there, with most of that demand transferred to gasoline. So, supply and demand kicks in to increase gasoline prices and reduce diesel prices.