Most of the time I drive alone, my girlfriend is something like 105 lbs when she is in the car (underweight lol). I myself weigh 155 lbs, and I don't carry around anything in the car.

Tires are 205/45/16, on Konig Helium in 16". Car is lowered on Swift springs, only mods to car's performance right now are the KWSC, NGK colder plugs (the one that OJR recommended earlier in the thread), and Megan axleback. Tires are all set at 43 psi.

Using Mobil 1 synthetic 5W-20, last oil change was 1500 miles ago. Filter is Super-Tech from Walmart. Last ATF change was with OEM Honda ATF ~1000 miles ago.

Here's the thing, I've never gotten a great tank of gas the whole time I've had the car. After hearing about how great the mileage is from this forum, I was holding out till the engine hit around 10k to see if it got any better - which it did by a tiny bit - giving me 28 mpg at the time (because I was driving slowly w/ aid of scangauge). Once I stopped using the Scangauge and got the Blitz TC, my mpg dropped to 26.

Right now I know 23mpg isn't "good" even by my standards and experience with this car - however, it beats the 10-20mpg I was getting (after KWSC install), and before I ran a bottle of fuel injector cleaner through it.

If I knew my car would be a lemon or whatever the problem is causing the drastic difference in mpg from other socal Fit AT users, I would have gone with something else. Not like it matters though now that I've spent so much on the car and I like it so much despite the huge problem that I'm having with my gas disappearing.

I'm going to run another bottle of cleaner through the car and see if it helps any further.

 

I am at a complete loss and only have a couple more thing to throw at you. Mileage at first oil change and oil consumption? Also did you break it in fast or follow the stupid factory instructions? (The last question might be a trick, no not at all)

 

I think first oil change was at ~6500 miles, followed the maintenance minder and changed at 5%.

I didn't break it in fast, but drove it around "normally" - aka not like a grandma but never beating on it. Just to give you an idea, I didn't go up to 5k rpm for at least half a year that I had the car.

 

There is another thread " Are you ever embarrassed by your fit" about the Automatic mileage figures. The slow break in might mean that your engine is still a little tight, but it appears that the numbers that you are getting aren't too out of the ordinary. an AEM tuning device (if it allows timing adjustments) and a methanol Water injector might help. Some consolation might be that the 2Nd. generation Fits claim lower automatic mileage figures.

 

Seems like I missed that thread - I'll check it out. Thanks for tips Texas Coyote, always good to have people like you on this forum.

 

if your notice a loss of power/hissing noise check your clamps. especially the ones by the s/c unit itself. Mine and several others i know had that problem from the change in temp back there over time loosened them. I got t-bolts and never had a problem since. specifically the clamp that holds the smaller pipe in place that feeds the outgoing air to the t/b.

If you have an a/t you should be changing your tranny fuild every 15-20K no later than that.

 

I'll be checking my header and all clamps near the header tomorrow. I just put a fresh bottle of fuel cleaner in the tank and the car already seemed smoother and more responsive on the drive back from the gas station. I'll update later with mpg once I get at least 1/2 tank spent.

I think I'll even get a can of BG44K and see if that does anything.

 

Change to 5w-20 oil if you are not using it, and check to make sure your tires are properly inflated. Also if you are concerned about your supercharger kit being messed up we could always meet up and compare notes on each others cars to see if there are any major differences. I'm free this saturday if you are interested, I'm pretty confident my car is running in tip top condition so it would be a good example if you are having an issue with your car. Also I already have a header on there so you can see if putting an aftermarket helps in terms of power.

 

I noticed that skunk 2 is having an open house on saturday so if you can make it to that we could meet up there. I'm kinda low on my rotrex fluid and was looking at picking a bottle up anyways so that will give me an excuse to drive down there.

Tom

 

Thanks for the offer DynamicFit, but I don't think I'll be able to make the Sat open house. For now though, I am going to test out how well some more fuel system cleaner (including a can of BG44K on the way) will work to improve performance/mpg. At the moment I have a nearly full tank with a bottle of over the counter cleaner in it - and for the 20 or so miles I drove today, the car was already much smoother, accelerated better, and was overall more responsive than yesterday night before I put the cleaner in. Considering how the otc cleaners are supposed to be useless, I think they're doing a great job for me so far - who knows what kind of improvement I might see with the BG44K (which is supposed to be the only and best cleaner that actually cleans out the deposits).

I also used the GD3 pedal stiffening spring DIY and I think that should help me gain some MPG due to how little throttle you can use to putz around with more resistance at the pedal. Definitely a very cheap and simple mod that everyone should do, I can't believe I never thought of it.

 

Koi I almost always use three ounces of Lucas fuel conditioner with three ounces of Berrymans B-12 and some high quality octane booster in my tank. I have had good results for 22000 miles. Keep us posted about the pedal spring fix. Good Luck.

 

I got the stock heatshield for the header back on after a few precise modifications (note: hammer & jigsaw) and it seems to be working pretty well. Nice and cool in the back area, car seems to be more consistent in responsiveness/power.

Just did a 0-65mph pull and have to say, the car is exactly the way I want it right now - sounds great and goes fast. If only my mpg could get fixed - oh well. Going to check my spark plugs today and hopefully that can of BG44K comes soon.

The only thing that's bothering me aside from the mpg is that the belt is somewhat noisy for the first 10 minutes or so after starting the car; I can hear it at idle and while accelerating during this time. Is it normal to expect some squealing from the belt, or if not, what should I do regarding checking on it? I'm kind of a newbie at what is probably normal routine maintenance on car engines (aside from oil/transmission fluid changes) so not sure what to do.

Just went to check the car right now and can't hear it at all. The car's been sitting in the sun after driving around for 15 minutes an hour or so ago. Definitely only hearing it on a cold start, not when the engine bay is nice and warm.

 

Put up some pics of the heatshield. How did you bolt it on with an aftermarket header?

As for the belt squeal move the alternator forward a bit closer to the radiator and that should fix the problem. Is it possible you got oil on it?

Edit: I doubt you need colder plugs. I was running them for a while and they did more harm than good. They foul too easily casue they are not self-cleaning. I am back to stock heat range. Pulled them yesterday and they looked great.

 

Glad to hear you are sorting things out. I plan to work on my heat shield as well. it sound like you do need to tighten the belt. loosen the bolt through the elongated slot in the bracket for the alternator and use a 1"X2" piece of wood 2 feet long as a lever and one that is about a foot long to place between the lower part of the engine block and the end of the first one pull the alternator towards the front of the car until about 3/4" of the elongated hole is left exposed and hold it in that position while tightening the bolt..... I didn't add my concoction to the fuel and I am having some cutting out at speed and dying at idle.....Ethanol I'm sure, but I am pulling the plugs tomorrow just because I haven't in 12000 miles and 400 since the super charger. I'm also doing the throttle spring fix as well.

 

My car has been idling kind of funny lately. It will idle around 500rpm while at a light and some times I can here it kind of struggling to keep running. A few times while waiting at a light it has even died, but then I can start it right back up no problem. Should I check the plugs maybe? I was thinking of taking it to Auto zone to see if they can pull any codes but I have never gotten a check engine lights.

 

Yours too? I am thinking that the oil companies are putting water diluted ethanol in the summertime fuel mixture.... The thing to do is add a methanol additive like "HEET" to absorb and displace the water.

 

add it to the oil? I recently had a oil change done. I think I was having this problem a little bit before the oil change though

 

You don't want to put any thing in the oil. The problem is more than likely from water accumulation in the gasoline. If adding "HEET" to the fuel tank doesn't straighten out the problem, then it is time to look at the plugs. You were kidding, right ?

 

@Leonine: Actually it's the stock header. The heatshield was rubbing against the tubing and the rubber so I hammered and cut away at the heatshield to get it to fit.

I'll try moving the alternator and see if that helps. I don't think I got oil on it, the only messy time I've had with the engine was with the ATF and that's on the other side of the engine.

Just did my first spark plug change, never done one before so I'm glad this went smoothly and the car is working fine afterwards (lol). Switched from the BKR7EIX-11 to just regular BKR7EIX (from .44 to .32 gap I believe). Here are pics of the BKR7EIX-11 I've been running for around a month:




How do these look? Normal? Fouled?

 

yes and no..lol I have been a wake for 19 hrs so my brain is not working to well right now.