I know this is an old thread but the 2003 4-Cylinder (2.4 Litre) Dodge Caravan has higher economy than the 2000 models but the 2001 or 2002 model years have economy about as comparable to a 3 Litre 2000 model.
Also, I've been driving a 2000 3-Litre model and we've managed over 25 MPG in it on multiple occasions with little stop and go driving, In hilly Pennsylvania so getting 31 MPG in a 2.4-Litre model sounds very close, And the EPA figures rate the 2.4 Litre model 1 MPG Combined higher than the 3-Litre model.
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