Rocky wrote:
> I am looking at
> http://www.fueleconomy.gov/feg/bymod...da_Civic.shtml but I can't
> tell why some Civic 1.5L 5spd get better MPG than other listed Civic 1.5L
> 5spd for the same year. Could it be because of 13" wheels on the DX & 14"
> wheel on the LX? The MPG ratings are 42/46, 40/45, 34/40. What trim line
> of 1994 Civic 5 speed gets the best MPG with a 1.5L 5 Speed? I assume this
> mileage will decline when the car is over 150,000 miles?
>
the list you cite does not appear to attribute any different mileage
between the lx & dx. much more likely, differences are due to trim
level, ie. the weight of the vehicle for the higher end models with all
the electric gizmos, a/c, etc.

mpg may increase with mileage, or it may decrease. depends on the car's
service history, how much crud has built up in the engine, state of the
ignition system, etc. as a general rule of thumb, engines in the 40,000
miles & up range are better than engines in the 5,000 mile range because
they're fully run in, their cylinder wall service glaze is in
equilibrium, etc. with a honda, 150k is only about half what you can
expect with reasonable care. there's no reason the vehicle should be a
gas consumption concern. best way to conserve gas is remove the a/c.