I see no increase in MPG with the DK. I do see it with the Lucas Fuel Treatment I am getting about 2 to 3 mpg more with the LFT. I use the DK to help increase the cetane from the crappy under 40 ULSD to hopefully up to around 42-43. Remember MB recommends a cetane of 50 at least in the 617.

I use the LFT to increase the lubricity.

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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"

Current
Monika '74 450 SL
BrownHilda '79 280SL
FoxyCleopatra '99 Chevy Suburban
Scarlett 2014 Jeep Cherokee
Krystal 2004 Volvo S60
Gone
'74 Jeep CJ5
'97 Jeep ZJ Laredo
Rudolf ‘86 300SDL
Bruno '81 300SD
Fritzi '84 BMW
'92 Subaru
'96 Impala SS
'71 Buick GS conv
'67 GTO conv
'63 Corvair conv
'57 Nomad