For me the most eco-driving friendly place I've driven is the Netherlands. The country is almost completely flat, urban speed limits are low, conurbations are frequent so you rarely spend long above urban speed limits, and other drivers didn't seem particularly aggressive so you aren't permanently whisked along in faster-flowing traffic.
I've previously driven a Yaris Hybrid over there, and a diesel Citroen C4 Cactus with an automated manual transmission, and in fairly regular driving I seem to recall achieving 60-65mpg pretty easily in each.
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