I too have the same frustration with cetane and wish every fuel station posted it. A couple local Texaco stations advertise "premium diesel fuel" but the price is no different from any other fuel station so I doubt it's really premium, although my car ran a little better on it. By the way, the Chevron website has an excellent write-up on diesel fuel. I also try fuels from different stations and recently my car has been running a lot smoother at cold idle with diesel fuel from a local Shell station, though on the pump it says it's a local brand, not Shell fuel. I do add a bottle of fuel additive at every fill-up to raise the cetane even more.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL