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You will likely find out that your mileage is LOWER from lugging the car in too tall of a gear, keeping the engine out of the range it is most efficient in.
The 16 valve DX motor likes a higher cruising rpm, say 2800-3200 rpm, over the lower rpms the HF/CX or VX/HX on low cam to keep intake port velocities up. This helps with even fuel atomization and dispersion in the cylinder.Just look at the throttle body diameter.
Now with better aero than I had 10 years ago it might be possible to lower the cruising rpm without lugging the motor.
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