Look at the 92-95 Civic VX, smaller intake runner diameter and smaller diameter exhaust system. Bought mine salvage in 08 with 27,492 actual miles.
Mine would cruise easily at 1000 RPM at 30 MPH, because it was purposefully designed with several system modifications incorporated to work together properly.
On one trip of 300 miles I got it to 68 MPG in the early summer of 2008, carrying two people and other stuff that totalled 500 pounds. Speeds averaging 60 MPH on the 15 year old original tires made in March of 1993.
You can search the web and find what they did to the VX to make it one of the all time mileage champs, and none of it was for performance. Compare the mileage to a standard DX or an SI model of the same body style to understand the cost of performance over economy.
regards
Mech
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