Took a trip to Santa Barbara last week, on I-5 and US-101, but in our gas minivan. In general, diesel was cheaper than regular unleaded, but varies widely. I saw from $4.35/gal to $5.70/gal, while cheapest RUG was $4.37/gal. Perhaps some stations have older stock and price it based on what they paid. In Sacramento, I prefer Propel HPR Renewable Diesel, which is $4.43/gal, slightly cheaper than off-brand RUG. My engine runs smoother, quieter, and without the smell of D2. Works in any diesel (no mod's), subsidized via carbon-credits (93% carbon-neutral). Union76 also sells renewable (R99), but $5.20/gal last I checked.

I noticed that cheaper diesel at other name-brand stations tends to be B20 (20% biodiesel). Unlike "renewable", which is chemically converted from ag-waste to not gel until same temperatures as D2, B20 might gel though perhaps no concern in Summer. Anybody know any downsides of using B20? Slightly poorer mileage? I understand some owners prefer it due to higher cetane and/or lubricity.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans