I've had the Paseo a few years now and have done several modifications to it. The 1.5L 16V engine currently has a shaved and ported head, bored throttle body, underdrive pulley, cold air intake, and a header with performance 2" mandrel bent exhaust. I built it to get more power out of it, and that was fun. But, now its time to get more mileage out of it. If you click my signature and/or look below you can see that I'm averaging mid to upper 40s out of the car as is in winter conditions. The last tank was a hair above 50, and the goal for this summer is 60 mpg. So, where do I start? First off is probably aerodynamic mods. They are cheap and easy to do. The car sees 95% highway as its my daily commuter vehicle, so this will be the most cost effective place to start. I am starting with something that is reasonably good with a drag coefficient of .32 and a frontal area of 19.0ft^2 (1.77m^2). I'm thinking of mosly using a bellypan of sorts to smooth the underbody airflow. There isn't a whole lot of area up front to block for the grill, but I'll be looking into that as well. There is a possibility of rear wheel skirts, but I'm not sold on this just yet. I've also been looking at GM's EV-1 electric vehicle with a Cd of .19 and looking to immitate its front bumper to some extent. Some aerodynamic testing will need to be done to see where flow seperation occurs. The rear spoiler may have to go. I'll also looking into front wheel air deflectors once the belly pan is done. Of course there are other areas to work on too. Here are a few other things I'm looking into: continue to refine driving technique remove underdrive pulley (did this last weekend actually) go back to stock throttle body (already have this, just need to install) new exhaust (will definitly have this come summer) stock or new intake new head with some port work done regearing The first 'mod', if you even want to call it that, was actually done a few weeks ago when I put the underbody panels back on the car. I had remove them a long time ago when I was doing engine and exhaust work and never put them back on. Unfortunately, its so freakin cold out I didn't do any before and after coast down tests to see the effects of the panels. Stainless fasteners... priceless in Wisconsin's salty road conditions. The panels. Before. After, and a bit more aerodynamic I'd imagine.