You are definitely making me want to save up for GL in a year or two that has the air suspension. The great thing about diesels is they almost always do better than the EPA estimates. I am pretty impressed if you shop around you can find ULSD at a decent price especially near at a shell or BP that is trying to compete with Home Depot is selling LSD.

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My Daily : 96 E-300 Diesel with 195,000 miles
Retired: 92 300D 2.5 T 345K miles and for sale
Retired: 95 E320 157K miles and currently parked with blown engine

Both retired cars are for sale as is my w124 shop inventory