About: http://webisa.webdatacommons.org/296626137

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	I believe, the answer is a small but quantifiable, yes, there is a non flat road configuration that would lead to better gas mileage between any two points at the same height.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com