I have been a dedicated Chevron fuel user for years, due to their top-tier quality rankings, even though they are among the most expensive in Los Angeles. Their diesel has been consistently running at $4.69. Within a 2 block stretch there is also an Arco selling D2 @ $4.39, and two Shell stations, one RIGHT NEXT DOOR to the Chevron with D2 @ $4.19, another a block away right off the freeway @ $4.29. HPFP paranoa has kept me loyal to Chevron, but I finally had to try the Shell and save $7 a tank. BTW, I also religiously use Diesel Kleen every tankful. I will be keeping an eye on my mileage to see if there is any change. I recall seeing that Shell Diesel was of a somewhat lower cetane nationally that Chevron, but not by a huge amount. Anyone care to tell me why such a huge difference in $$$ and if I am safe with this fuel + additive?