The 3 spd autos make 40 mpg pretty hard to get unless you can pulse and glide from like 50mph to 20mph without having other drivers kill you... Also I'm pretty sure those autos didn't lock the converter either.
I have the same auto in my 95 neon with a locking torque converter and a good commute to coast down hills and I can get into the high 30's for a commute but its hard to get a whole tank up there. Any city driving brings the average down. At 60 mph my car runs at 2700 rpm too which is a bit high for good mpg. On the plus side the tranny doesn't seem to mind going from N to D at 55-60mph.
Free cars are good though, and you could probably get low 30's out of them without to much trouble.
Ian
ps, I forgot some of the omni's used lean burn technology back then, so they may do better than I thought. If yours are lean burners then getting a manual trans might push you into the 50's
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