Is this a DX? If so, its engine is identical to my 91 Civic LX. My owner's
manual gives the following shift points for best fuel economy and optimal
emission control:

Shift up // Normal Acceleration // Cruise from Acceleration

1st-2nd // 15 mph // 9 mph
2nd-3rd // 27 mph // 20 mph
3rd-4th // 39 mph // 33 mph
4th-5th // 53 mph // 48 mph

I have a 1984-1995 Civic Chilton's and it's fine. Bought it on Ebay.
www.Helminc.com sells the original shop manual. Also http://www.autozone.com
has free online Honda manuals for 1995 and earlier models only. On the left,
click on "Repair Info," then "Vehicle Repair Guides." Click on car year,
make, and model, etc.

See my site http://home.earthlink.net/~honda.lioness/id9.html for more info
that might be helpful for working on your 91 Civic.

<mgmonza@sdf.lonestar.org> wrote
> I just bought a 1991 Civic wagon, unfortunately missing the owners manual.
> Anyone know the optimum cruising RPMs? My last car was a Camry from the
> odd years when those had a tachometer as standard equipment for the
> automatic transmissions, but were missing one for the one I had, the 5
> speed manual. I shifted by speeds listed in the owneres manal (high
> compared to most cars) and engine sound.
>
> I could really use a shop manual for the Honda, too - the Chilton's I
> bought is not real useful. Can't find where Haynes makes one. Anyone
> know where to get the Official shop manual?