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I have a 04 civic EX with 1.7L 4-banger and manual gearbox, it revs 3000 at 60mph, 4000 at 80, and 5000 at 90mph. I took a trip to Seattle, WA from Los Angeles CA. Before trip I put 10w30 Mobile 1 oil with M1 filter. Traveled the whole way at 85+ mph which is 4700-5000rpm constantly, got 32mpg average, and was surprised to see oil clear as new when I came back to LA after almost 3000 mile road trip under those conditions. The car has 60k miles, has zero oil consumption and purrs like a kitten every morning. Also under the valve cover it is incredebly clean. Must have cleaned up after high speed drivingI have also noticed that high rpm doesnt increase fuel consumption as much as load.![]()
Those rpm numbers seem high. I too have an '04 Civic LX 5 speed MT (non V-tec). and at 80mph I turn 3300 RPMs. I have 45000 miles. Is your clutch slipping?
No, these seem about right. The EX Civics, which have VTEC, have a much lower fifth gear than the non-Ex's. My mom's 04 EX does about 4000 RPM at 80 MPH. I've never measured the MPG on it though. It's so noisy at highway speeds!