Highway speeds with A/C on a good day will touch 29 mpg. Combined intra-city and highway 27 mpg on an 86SDL with 220K.
BUT....driving style seems to dictate my biggest drops in mpg. If I am keeping the toenails in the firewall, flooring it, etc - it will set down in the low 20's easily.

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15 VW Passat TDI
00 E420
98 E300 DT
97 E420 Donor Car - NEED PARTS? PM ME!
97 S500
97 E300D
86 Holden Jackaroo Turbo D
86 300SDL
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