To my knowledge there is no button. There is a small recess at the back top edge that you slide your finger in and pull to open. Gently! If you get a clunk when you pull and the filler door stops, your vacuum operated lid lock is in the locked position. Unlock the car and try again. If the filler lid is locked with the car unlocked try started the car to 'charge' the vacuum system. If this does not work you will have to open the trunk to access the lock, and manually push the locking pin back.
21 gallons.
http://www.peachparts.com/shopforum/diesel-discussion/215532-vacuum-door-locks-not-working-1983-300d.html
25 to 30 mpg
The selection of diesel fueled Mercedes Benz cars can be found on the Mercedes Benz website. One could also visit their local Mercedes Benz dealership to speak with a salesperson about the options.
The 2012 Mercedes-Benz Sprinter runs on diesel.
The 2010 Mercedes-Benz Sprinter runs on diesel.
The 2014 Mercedes-Benz Sprinter runs on diesel.
The Mercedes-Benz 260D, first diesel engined passenger car in the world was introduced by Daimler-Benz in 1936, and produced through 1940.
The 2013 Mercedes-Benz Sprinter runs on diesel fuel.
The 2011 Mercedes-Benz Sprinter runs on diesel fuel.
The 2008 Mercedes-Benz GL-Class runs on diesel.
The 2012 Mercedes-Benz GL-Class runs on diesel.