I have only bought diesel at Speedway and Meijer Gas so far over the past 1.5 years.....I think I might check out Amoco to see what they have around here, especially if its cheaper, at Meijer its up to $2.26 (premium is 2.06) and at speedway its probably 2.28......Meijer tends to have quite good fuel however, their's a premium (at least it says so) and claims to have additives for increased lubrication/more power/less smoke. I don't know how true these claims are, but my car puts out very little smoke usually (unless I am revving high). I don't think the pump has a cetane rating on it.....

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'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)