'92 Civic DX sedan...96K mi. Cold air (short) intake, stock 13" wheels...29 - 32 mpg in town...up to 42 mpg highway (if kept under 80 mph)....29 mpg on highway (if kept over 90 mph). I've found that vehicle weight (single vs. multiple occupants, tools, etc.) greatly affects efficiency, as does proper ignition timing.