Hi all, I am new to this forum and very interested in improving my MPG. I have an old 87 Civic DX with the "FE" carburated D15 SOHC engine (I am disapointed that I'll never be able to use a scanguage ). I am averaging around 38 mpg now (50/50 city highway) without any mods and am looking into doing a 5th gear swap or putting in an FE transmission (actually I am not even sure whether or not it has an FE trans in it now).
At 60 mph, in 5th gear, my motor is turning at 2600 rpms. Could some of you share your gearing info/mpg with me (engine rpm at 60 MPH and approximate mileage at that speed) so I could get an idea if changing out my trans would be worthwhile?
my civic vx runs at about 1,700 rpm going 60mph with the stock vx tranny, even going 85mph, the engine is still only turning at about 2,400 rpm, it freaks me out every time I drive other cars and have the engine rev so high, the only time I see 3,000 rpm is when I'm trying not to get hit by a semi on the highway on ramp.
not sure what kind of mileage I'm getting at 60mph, because I don't have any real time feedback device, and do a weird mix of driving right now.
aside from the FE carb, I would recomend a better cam, if you are going to replace the tranny, otherwise your engine isn't going to be tuned to run at those slower speeds.