The gasser W124s didn't have an economy gauge (can't say for sure about the diesel versions)...Our former R129 did however.

__________________
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car