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REPORT (1992): Auto FE: How Far Can We go? (a few notes)
I found this interesting, and I thought I'd share and see what others find believable.
From "Automotive Fuel Economy: How Far Can We Go?" (National Academies Press, 1992) by "Committee Staff on Fuel Economy of Automobiles," Appendix B, p.202:
1 - claims that 5-6% increase in compression (9.0:1 to 9.5:1) would yield 1.3 to 2.0% increase in FE.
2 - On p.205-6 under "variable valve timing" Honda's VTEC-e in the VX is specifically cited as producing 15% more torque at 2000 rpms than the DX. The report claims Honda asserts that VTEC-e along with lean burn produces 10-15% greater FE but even without lean burn the variable timing still produces 7-8% better FE.
3 - On p. 212 the authors of the report (not Honda) claim that aerodynamic differences between the VX and DX account for 0.7% of the FE improvements in the VX. [I wonder what the differences were?]
4 - On page 212 the report claims that a 10% decrease in drag will produce a 2.3 or 2.4% increase in MPG.
5 - On p. 212, a 10% weight reduction yields a 5% increase in FE.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
Last edited by California98Civic; 01-24-2012 at 01:13 AM..
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