84 300SD, 215K miles, started out North of Nashville to the first leg at Niagara Falls. Averaged 28 MPG running at 68MPH. Filled up before i left on May 17th in Clarksville TN at $3.90 gall (.10 cents less with discount from dealership). 3 hours into the trip outside Louisville the exhaust pipe dropped and came apart. On inspection, it appeared that since there were no hangers holding the center exhaust up, the pipe slipped out after the drop from the exhaust manifold. Let her cool and pushed the pipes back together and used 2 bungee cords to hang her. This lasted until i arrived in philadelphia on the 21st. So with a short 1/2 hour delay we were back on the road again. Drove up towards Cleveland then along the lake into Penna then New York before crossing over the bridge into Canada. Filled up just before reaching Cleveland for $4.49 gal. Spent 2 1/2 days in Niagara falls then onto Philadelphia on the 21st. Next fill up was in New York at $4.89 gal- - - WOW. The next tank lasted until we left Phialdelphia for Cape May ,NJ and the Memorial Day weekend which is where we are now. Fill up in Vineland NJ at Riggins for $4.49 Gal which is now up to $4.69 gal in 3 days.
Next stop is Raleigh NC and we leave on Tuesday the 27th. Will keep you updated.
All I can say is the 300SD is humming along perfectly. Very comfortable driving except for when the cruise control acts up and does not want to work. Will fix that when we get back home the end of the week.
I will post some pics and probably upload the videos to my web site when we get back.

Sounds like fun! I always like a good road trip, and these cars are fantastic over the road machines.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

And it might be my imagination, but after running a few hours on freeway the car seems to run smoother.

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86 300SDL

It really could be running smoother. Maybe you blasted some carbon off during that highway run.

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

They do run better after a long freeway run. I took my SDL on a little 50 mile trip today and it loved it. I wasn't going to drive because I didn't want to burn the fuel, but it hadn't been on the open road in so long I felt bad.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200