how about taking european mini vans into the equations and not american ones with big engines few people need ?
VW sharan 2.0 TDI:
Fuel Consumption
Urban 34.0mpg - 8.3l/100km
Extra-urban 49.6mpg - 5.7l/100km
Combined 42.8mpg - 6.6l/100km
140 HP, 229 lbs.ft / 320 NM torque
renault espace grand dynamique 175 FAP
Combined - mpg (litres/100km) 37.1 (7.6)
Maximum Power - hp DIN (kw ISO) 175 (127)
Maximum Torque - Nm ISO (mkg DIN) 360
pretty much all car companies have something of that size (ford galazy, fiat ulyssus,etc.) ... and if that's not enough you can still buy a VW T5/Carvelle/Multivan with a 2.5 TDi with 128 kW 6 gears and 400 NM torque