I can get B100 here in Santa Barbara for $3.50/gallon. That includes the standard state (18 cents/gal) and federal taxes (24.4 cents/gal), sales tax (7.75%) and among a few other little things a "california oil spill tax" - what a load of crap
but at least it isn't more than a couple cents.
It used to be $3.00/gallon last year, and I'd heard of it being $2.50 in some places. Regular petro-diesel is $2.50 or more now here... Biodiesel would be a much more viable option now except of the rising cost of veggie oil
.