I recently posted a thread on this topic with a response I received from VDO regarding fuel gauges on MBs. I'm convinced they have an inherent fault.
It's one thing, as Dennis mentioned, to have an asymmetrical tank which produces a non-linear reading past the 1/2 mark as the tank's shape and volume changes. That's all good and fine as long as the gauge is working properly.
The main problems with Mercedes is that the gauge seems to have a demented mind of its own past the 1/2 mark, as someguyfromMaryland put so well.
VDO of course denied any defect in their gauges.
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired
"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon