I had a 92 turbo diesel (not eco diesel) and it would get 5.2L/100kms (45mpgUS) all day long with only cruise used on the highway, I didn't know about aero at all back then. I got ~4.3L/100km (55mpgUS) a few times on some long summer trips when there was no wind. Good car for fuel economy, I was always seeming to tinker with it trying to get it not not run too hot.
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2013 Honda Civic Si - 2.4L
OEM front to back belly pan from the factory.
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