I'll go ahead and claim this E55 record now. Can you claim any records?
The Best of Mercedes & AMG
Attachment 279327




my avg is 12.5 over 600 miles from last reset.
I was getting 23.5-24 mpg with a 120 mile cruise at 75 mph average. All at about 70 feet above sea level. Dennis and I both run the same big valve ported race heads and thats when the MPG increase came.
We found a lot of the stock intake valves have bad casting centers on them and this tends to make for a bad factory valve job (loss of power and MPG).

E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
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Love them ported heads!













