Ok.. On my newest car, a 1992 Honda Civic CX, I've decided that I like the newly found gas mileage. (54.996mpg the first tank, no shit) Now, 70 HP just isn't working for me, So I'm looking to get something like 125 HP at 50 MPG. This will be a project for sure. I'm pretty sure I can get those HP numbers out of a vtec head swap, but then my mileage will go down to something like 35.. SO.. What about raising the compression of the motor? Is that really just free power? You take the same amount of fuel and air and compress it harder, it makes more power. The downside is that it leads to detonation. What kind of compression can your basic 87 octane fuel handle? 10:1? 12:1? My thought is to get the D16A6 head, do a p&p, polish the combustion chambers, weld in quench zones, and shave the holy crap out of it. Get the compression up there... With the larger intake, exhaust, a high flow filter, and high compression, I should be able to eek out something like 120hp. I think. The goal is to raise the horsepower without completely jacking the gas mileage. (45-50mpg is the goal) Thoughts, suggestions? It can be done... It'll just take some engineering.