I have a 93 Prizm and I get 26 mpg overall.
Geo Prizms have no grease fittings. All parts are sealed units and simply must be replaced when they wear out.
Both engines are.
The door speakers in Geo Prizms From 1993-1997 and possibly newer are 4in. and the rear speakers are 6.5in.
It depends on the year. 1989 - 1994 Geo Metros will usually get 35mpg city/50 mpg Highway. 1995 - 2001 will get anywhere from 30mpg city/ 45 mpg highway. If you have the super rare 1991 - 1994 Geo Metro XFI that I have you can get up to 60 mpg. These are all based on Geo Metros with stickshifts.
The Geo Prizm GSi alrady has a 4AGE smallport MAP sensor engine. The other model of Prizms have the 4AFE engine, which would be a downgrade in performance.
30 mpg in city, speaking of conservative driving, and if you drive 55 and no faster on the freeway conservatively it can actually get up to 50 mpg. I have one myself and we've tested the mpg many times.
About 39-44 MPG
My 1990 geo gets 29-31 mpg. My odometer reads 280'000+ but Idont know how correct that is. I have a '91 that gets 35-36 mpg on the freeway and it's an automatic.
According to studies done by the federal government, the 1993 Geo Metro gets 38 MPG (miles per gallon) in the city and 45 MPG on the highway. The estimated annual fuel cost is $944.
I get between 28 and 32 mpg at 55 mph. ed
There are many factors and way to increase the MPG in your Metro. Tire pressure, timing, spark plugs, air filter, fuel filter. I also found this place to be very helpful http://www.teamswift.net/viewtopic.php?t=17057
I have a 93 and it gets 25 MPG around town. A little better on the highway, but not much.