'92 MTX - Miles Per Gallon???

[Johnny_Eye]

I'm getting only about 22 MPG on my '92 MTX (98,000 miles). I drive about 75% highway with not a lot of revving (really). I hear about folks on the board getting high 20s. Is 22 more typical and all I should expect?

I recently installed the Midwest SHO Hi flo Y-pipe and replaced the O2 sensors at the same time. I'm running a K&N air filter with the stock box. Everything else is pretty much stock. Would a fresh set of plugs/wires maybe help? The car is new to me, but I believe it had it's second 60K about 10,000 miles ago.

I'd really appreciate any additional thoughts or suggestions as to how I might be able to do better.

Thanks.

 

[SuperHO]

Go with plugs and wires.....on repeated trips between Kalamazoo, MI and Savannah, GA I'd get between 30 and 35mpg with the cruise set at 80. I had a 3.2, 3.0 cams, same stuff as you without the y-pipe and a 45lb sub box in the trunk.