Top Tier Gasoline vs. Diesel

[deutsch100]

Since my first "premium" new car in 1995, I have ALWAYS used Chevron Supreme gasoline (per the recommendation by my Mercedes and BMW Service Advisors).

Now that I have a Diesel, does it matter? There is a Chevron somewhat close to my son's school, but not close to home, that has Diesel #2 (new station, great pumps, family owned...).

Very close to home, is a Shell station that also has Diesel #2. I have NEVER used Shell gas, as it always seemed "cheap" and inferior to Chevron.

Is Diesel fuel top tier rated, as gasoline is? Is Shell Diesel the same as Chevron Diesel? Also, the Shell station is consistently 5-10 cents a gallon less than Chevron Diesel and gasoline.

I need to diesel up in the next few days, and since my son is out of school for Christmas Break, I do not know whether to drive to the Chevron station, or just go around the corner to the local Shell station!

Also, I know part of my OCD , but I never have mixed brands of gasoline. I always think since Chevron has Techron and 76 or Shell do not...it will cause a problem. If I use Chevron Diesel, and then for some reason do not have time to drive back to Chevron for the next fill up, can I use Shell or Union 76 Diesel? Does it matter in the slightest bit??

Thanks a lot!!