That's exactly what it is. Increasing the timing for cruising. Plus my car breathes really good with the open cone, ported blower/LIM, headers, full exhaust, etc.

Oh yeah, I have u-bend delete too. I'm still driving stock intake box. If I got open cone then I'm pretty sure it will help lot. I'm thinking FWI but I know they are bad for raining.

Since I'm same driving habit but my both cars are not same.

Example, my summer car get 500 mileage in full of gas tank.

My winter car get around 400 in full of gas tank. I need to work on that winter car for tune them and get rid of u-bend too.

Right after I got the car I was able to average 32 mpg on a 400 mile trip with a fully-loaded trunk and the ac on averaging 75 mph, everyone with 4 bangers was asking how I could get the same or better mileage with a supercharged 6

Its a performance tune. 93 oct. Hmm Ill have to buy a tuner now. Take a look at my tables.

i get 35mpg at 65mph and 30mpg at 80mph

hydro kit

bummer. I hafta get a better exh (cat, ubend, d/p) and a performance-sucking tune. Think I'll get the exh and keep my tune minus the cooling fan and tranny pressure tunes. Thanks, Corey.

Wait, I think you misinterpreted, or I am not understanding what you're saying. My car was running 13's with that very tune. You don't need a different tune in order to get good mileage. It's the same tune.

OH! Yeah, there was a disconnect. My question was:

after installing a 3" d/p, high-flow Magnaflow cat with u-bend delete

already having a Wizaired CAI

wanting a tune to increase tranny line pressure and to allow the cooling fans to run longer after shut-down

do I need to retune my PCM to maximize fuel efficiency?

If I do retune the PCM, will that sacrifice performance? If so, how much?

This car is a dog off the line (compared to the Camaro), she's heavy, and has an almost anemic downshift (compared to the Camaro), so I dont wanna lose much performance.

Talking to Slick, he had told me that there are very few ways to tune for efficiency AND performance, or at least maintain performance. If you have a tune, or know of a tune, please do share. I think I'm gonna be buying the exh components in less than 6 months.

Richard,

I get my mileage with an off the shelf ZZP tune.

i get 20mpg on the highway
13 in the city
about 2 mpg at the strip

that's on 110 leaded sunoco

I get around 24 mpg on the freeway... in third gear. :p 28-30 when my fourth was still working.

How is the electrolysis done?

When you separate H2O into Hydrogen and Oxygen, it uses more energy to separate the molecules than what you get by burning the components (basic chemistry).

So what I'm saying is, if somehow his car is turning water into Hydrogen and burning it...then the parasitic loss is more than what he's gaining.

If he's doing the electrolysis at home and then transporting the hydrogen to his car, I would like to know more.

You are no wheres close.

He has 2 canisters out of rubber or pvc or w.e Pvc can melt under the heat of electrolysis unless it can get cooling air.

1 of them has 6 sheets of stainless about 5 inches tall and 2-3 wide. 4mm thick. The first one is positive the second negative third positive and so on. All have rubber/ plastic washers inbetween them and are connected by two screws through the middle.

He connects the negatives together and the positives and connects electrical wire to the screws.

Fills it up to the top of the plates with distilled water and a pinch of baking soda. Canister is about 10in tall so 6 in of it is full of water. Then at the top he has a fitting going to a line that leads to the second canister with normal water in it. When the hydrogen leaves the first canister and goes into the second one it purify's the hydrogen and also works as a check valve. Then another fitting and line ontop of that one leads to your intake / charge pipe.

He connects the electrical lines to a relay and then to a fuse and wires it so that it only goes on when the engine is running.

The next step he has is using coils inside the electrolysis canister that run to a flow jet pump and to a reservoir and a small fmhe to keep the canister cool with coolant.

new plugs always seem to help mine and if you have anywhere near 100K miles on your car the O2 sensor probably needs swapping out. O2 sensor probablybeing the biggest culprit of slowly degrading mileage in older cars.

You much be lucky, cuz I'm not doing it. Got a K&N intake, ZZP PCM, HV TB, new plugs, wires, and oil, and I can't get over mid-20s on the highway, despite getting over the 18 advertised with a heavy foot in the city.