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firehawk618 · 03-28-2015, 04:29 AM

It's physically impossible for your RPM to MPH correlation to have changed without any modifications *transmission* or clutch slipping *which would not be a consistent 100rpm difference*.

I would place the blame on either the speedometer or tachometer being inaccurate.

Considering the weather you describe and a massive amount of idle time 35Mpg seems pretty good to be honest.

I believe these guys who get north of 50Mpg in their VX or HX are very careful drivers.

03-28-2015, 04:29 AM	#10 (permalink)
firehawk618 EcoModding Apprentice Join Date: Oct 2014 Location: Marysville, wa Posts: 221 97 Civic HX sedan VX trans - '98 Honda Civic LX + HX + VX 90 day: 41.9 mpg (US) Thanks: 23 Thanked 42 Times in 24 Posts	It's physically impossible for your RPM to MPH correlation to have changed without any modifications transmission or clutch slipping which would not be a consistent 100rpm difference. I would place the blame on either the speedometer or tachometer being inaccurate. Considering the weather you describe and a massive amount of idle time 35Mpg seems pretty good to be honest. I believe these guys who get north of 50Mpg in their VX or HX are very careful drivers. __________________ 1998 LX with a full HX swap + VX transaxle.