I don't know if you guys know this but the 8th gen civic has a sweet spot for highway speeds. My mom has an automatic but when she drives 65mph the scanguage will show high 50's/low 60's MPG. Also if you're driving around 40mph and just depress the gas a little bit the car will go into 5th and stay there, howering at around 1300rpm.
For the manual civic I would use a scanguage and find out it's sweet spot for freeway cruising.
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