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Sounds a bit hard to do.
Ford did have some 5 cylinder diesel Transits. I don't think they offer the diesel option anymore.
GM offers the Chevy Express or GMC Savana with a 4 cylinder diesel option.
Of course none of these have manual transmissions. But with 10 speed automatics, your probably better off with the automatic unless you want to shift through 11 gears (manuals need one more gear than an automatic to be comparable.)
The Ford Transit Connect and Dodge Promaster are midsized vans and I'm not sure if they offer any with a diesel engine. The others I mentioned above are full sized and come with extended versions in the one ton variety. Even in the half ton they are the next step up from the midsized vans as I'm unsure if there's an extended midsized van right now like back when you could get a Chevy Astro in short or long wheel bases.
Could you explain highway average a bit more? Flying down the highway at 90mph and then going through start and stop traffic at around 30mph might average 60 but would be terribly hard to get good fuel mileage from.
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