Another option for sub bass is infinite baffle. Has easily the lowest power requirements of any setup. Also has the ability to dig the lowest. Does require a high pass filter to be able to protect the sub. Its as efficient as a sealed box, and has the best group delay. Its also generally lighter than a box.
Brand? Whatever floats your boat. Mobil 1 is not that expensive and is readily available.
Weight? If it's the original D15 (B2?) motor, I remember that 5W30 is one of the recommended ones. I wouldn't hesitate to run 0W30, but I don't think I'd go as far as 0W20. If you still have the owner's manual, you can check in there.
I filled my tires to 46psi
Removed passenger side windshield wiper
Performed a SeaFoam clean
Put Lucas in the tank
After this I filled up and got 56 mpg. My average in this cold has been 45mpg. That's a HUGE improvement.
Also for this next tank I drove a ways to get ethanol free gas and I advanced the timing a bit. I've also been using my camera tripod as a makeshift cruise control haha.. I'll post a photo of that. It actually works quite nicely once I get it set. And I just have to tap it off so it's pretty safe.
Check out my project here---> 1989 CRX HF
Chilton's is fine, but these are the Honda offical service manuals, longer and far more detailed. The one for my 98 Civic is over 1400 pages. Some of your questions may be better answered by the longer official manual.
Black and Green'sgarage entry has abundant detail and notes for Civic modders. I will rebuild this car over decades as parts die--until it becomes a different car of roughly the same shape.
My fuel economy goal is 60-70 mpg while averaging posted speed limits--not the highest possible mileage. I reach the goal when the weather is warmer, and have to slow down when it's colder.
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