Chevron gas on the left coast has Techtron in it. That is why it is more expensive and widely recommended in CA. They have so many stupid rules about gas that the typical stuff will ruin a high performance car. The max octaine in CA is 91.

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'07 650i Coupe - Black Sapphire Metallic
M6 bumpers, skirts & wheels
BMW M Cross Spoke Composite 101 Rims 20"
HUD, Comfort Access