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hey there my fellow honda drivers. i was wondering what the best setup would be to get the most gas milage out of my car which is a 93 civic ex. i have an after market intake, exhaust, manifold, and some other things and was wondering if i put these things back to stock would it help my gas milage?

 
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It it probable that returning to stock will help increase your gas mileage. Once you have done that, look within your car and see what you can take out of it. Obvious examples are: spare tire, rear seats, jack, junk you don't need or use...When I had my 02 ex I took about 120lbs out of the car and was getting about 45mpg. I have taken out about 100lbs out of my CRX and now I get around 60mpg. Hope this helps.

 
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yup weight savings make a huge difference. just have 1 or more people ride with you and see how bad acceleration, cornering, and braking become with the added weight. rotational weight (wheels/tires) makes an even bigger difference so keep the rims small and lightweight (forged).

 
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Go back stock with a high flow exhaust and air filter. Don't change anything that will alter the fuel input. I have a 93 1.5L stock with header, high flow exaust and about 250lbs of tools in the back, I get about 32 mpg in town and 45mpg on highway. I also have forged aluminum rims that help a lot too. I am going to get a K&N air filter that should help too. And when I run my air I lose about 2-3mpg.

 
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Less weight, less rolling resistance. I have an '89 DX hatchback 1.5 liter. I am running a Bosal 50mm cat-back, with a drop in K&N filter. I have also remove all of the duct work ahead of the air filter box. If you run any cat-back exhaust, you have to switch to the K&N filter, otherwise you'll get some nasty resonant frequencies, and dead spots around 3000 rpm in the powerband. I get between 38-42 mpg combined driving running it hard. Beware of cheap aftemarket alloy rims, most weigh alot more than the stock steel rims. Go here to compare wheel weights http://wheelweights.net/
Mr. DogCar

 
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Less weight, less rolling resistance. I have an '89 DX hatchback 1.5 liter. I am running a Bosal 50mm cat-back, with a drop in K&N filter. I have also remove all of the duct work ahead of the air filter box. If you run any cat-back exhaust, you have to switch to the K&N filter, otherwise you'll get some nasty resonant frequencies, and dead spots around 3000 rpm in the powerband. I get between 38-42 mpg combined driving running it hard. Beware of cheap aftemarket alloy rims, most weigh alot more than the stock steel rims. Go here to compare wheel weights http://wheelweights.net/
I keep my tire pressure around 36 psi.
Mr. DogCar

 
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Upgrade your grounding wires to a thicker peice, I think you can lean out fuel with a vafc or hondata, keep the intake and other stuff, go with the lightwieght rims and see if you can find a low rolling resistance tire. You can also build a front belly pan for pretty cheap, a grill block also. Check out www.ecomodders.com for some other aero ideas that go from mild to wild that can reduce drag, saving fuel. Try using a lighter oil that will still protect your motor, I have heard that some get away with running 0w20 in these motors with no issue. Airtabs could also benifit, as well as a lighter flywheel and lightened pulleys. Getting extreme, you can bump up your compression and do other things to really increase efficiency, which I am in the process of testing to see if they help/hurt efficiency/performance. Happy modding.

 
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I have been using 0W20 for the last 4 changes; no problems to report.

 
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The general rule thumb(though this doesn't pertain to gas mileage but it might help) is...

every 100lbs standing weight=.1 seconds on the quarter mile.
every 100lbs of rotating weight=1 second on the quarter mile.

rotating weight is just usually expensive to reduce..

rims
pulleys
flywheel
pistons
crank
rods
rotors
..even lugs
...pretty much any moving part in your car.

 
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What's the mileage penalty by for running 10w30 in my completely stock 1991 hatchback?

Berkey

 
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It has "some" to "significant" effect. Depends on driving habits, YMMV.

My mother had an 87 Accord, bought it new and drove it for 250k.
Dad said that it gained an easy and consistent 2-3 MPG when he switched it from 10w30 to 5w30.

A factory rep told me about a test that was done on an original Insight, started with the correct 0w20 oil and ended with 20w50. By the time they got to the 20w50 tests, the car had lost more than 100 miles per tank of gas. That's a lot IMO.