The faster you go the less MPG you will get. 60 mph gives me a big improvement over 70 mph. And the kicker is that unless you are driving for multiple hours, the time savings by driving faster is not significant. I'm not sure of the exact number, but I believe the HX enters VTEC at 2500 or 2800 RPM. This is not good for fuel economy, so you want to make sure to keep it in 12 valve mode. If you still feel the need to go fast, swap out the transmission for the CX/VX to lower your cruising RPM's a little bit. You can also install taller tires to help too.
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