While driving at 75 MPH will reduce gas mileage, something doesn't seem right. I have a D16Z6 (well, had... now it's a D16Z6 with a JDM D15B head, only diff. is more lobe separation on the cam) and our interstate speed limits here are 70 MPH so I usually drive 75 MPH, and I get over 30 mpg if I drive mostly highway... I consistently get 29.5 mpg driving about 40/60 highway/city.

I would be expect a VX to get 35+ mpg, more like 40+.

 

thanks guys! i changed the plugs,wires,cap,rotor,air filter,fuel filter. i went 115 miles today. filled it back up. used 1.7 gallons no lie! 67.6mpg!!!! but that was all highway going 60mph. but still 67mpg!! i love it!