I have not had any problems with the OVP Relay yet and am currently getting 22-23 in town and back and forth to work
(rural driving < 60MPH) and 26 on the Hwy @ 75-80MPH. My E
has 143K on it and still running good. It is starting to take a little longer to start after it sits for a few days
so I believe that I may need to replace the check valve in the fuel pump. Still the original OVP though. I have been using Mid grade fuel 89 oct and it runs the same as it did on Premium 91 oct.

__________________
Dave
88 300E 250K Sold
2000 C230K Totaled @104K
2003 ML320 156K Sold
2009 E350 4Matic Sport 46K Sold
2011 ML350 60K Sold
2014 GLK350 46k Sold
2012 GL450 72K For Sale
2016 E550 Cabriolet 48K Sold
2015 GLK350 114K