I normally get 22-24 from my 300D, but then it's got 326K on the original engine. Best ever was 25.5, worst was 19, fully loaded, 70 MPH into a 20MPH headwind.

The SD, bought at 300,000+ didn't get better than 21, it's down with a bad #3 cylinder (200PSI) and a knock- and I just haven't had time to pull the head to see what's going on.

No doubt a fresh engine in either car would help mielage a great deal.

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Nate Stanley
(Currently Benzless)
1985 F-250 6.9l 170K
2009 SCION XB 36.5K
2003 LS430 78K
2012 Kubota B 2320