If you shift around 2,000 rpms you can do it...that's how I got 23 mpg. Not too fun to drive but saves some gas...do it when Grandma is in the car or when you are in stop and go traffic. I tried to do that again on the next fill up but couldn't resist and ended up getting 22 MPG. And no... I don't drive like that all the time, I was trying to see the best MPG I could get outta the car since I see all these bad reviews on the car claiming 12-14 MPG.

The only thing I've done to the car is a drop in K&N. It's cheaper to get the oil changed at the dealership (believe it or not) and they put in fuel additive every 6,000 miles.

So no one has heard of the Fitch Catalyst.... I'm still waiting on them to email me back on which part I should use. I bet they will tell me to use the thing you drop in your fuel tank so I don't have to cut my fuel line and ruin my warranty. I gave the info to my buddy at the Mazda Dealership..he was going to look into it as well. I suppose if it's cheap enough I can try it. I calculated the savings of even gaining .5 mpg and it's worth it (depending on how many more miles you plan on putting on your car), but that's based on the cost of the unit you place in your fuel line ($177). I'm pretty skeptical but doing some research doesn't hurt.

 

I've never heard of the Fitch Catalyst. It sounds like snake oil but doing research can't hurt.

I guess I can see getting 23 if you shift that low in the range, but you're going to build-up carbon like crazy. And Kdlunge is saying he gets 22 with semi-aggressive driving on the city and highway- to me that means the needle is sweeping past 2k regularly.

 

Ok, got this message from Fitch. If you look at the last page of the horse power PDF it shows the savings as gallons per hour....not exactly MPG. Maybe that's their trick...I would call and double check on the part number since our car isen't listed. I'll go see my buddy at the dealership to check about warranty and about the product. I also know a guy who used to work on Nascar engines, I'll try and see him as well. The only reason why I'm looking is because of that Horsepower Show...but they might get incentives for promoting the product. It's a long shot, but a $100 long shot.

Thank you for your inquiry regarding the Fitch Permanent Fuel Treatment Device. You must have seen the Horsepower TV segment that performed a dyno evaluation of the Fitch Fuel Catalyst. Just by adding Fitch, Horsepower TV recorded improvements in horsepower, torque and fuel economy on the test engine supplied by GM (427 ci LS7).

For a limited time and only available through us, the Manufacturer, the Fitch Permanent Fuel Treatment is now available for $99.95 for all basic models with the prefix of F3, $149.95 for models with prefix F4, $169.95 for models with prefix F5 and $199.95 for models with prefix F75. The correct application for your vehicle is Fitch model F3624.

Warranted for the lifetime of your car while you own it, the Fitch easy to install “Bolt on Kit” will SAVE YOU MONEY.

You may order on line by going right to this order page for your part # F3624 http://www.fitchfuelcatalyst.com/cfm...291&drill=2292

OR you may contact our toll free number 1-888-881-2774 and a sales representative will assist you. Be sure to mention “Horsepower TV” when you call to get your Special Offer price. If you order from our website, type the words “Horsepower TV” under the section “OTHER NOTES” and this will guarantee your special price. The website will show our regular price but as long as you state the “Horsepower TV” in OTHER NOTES SECTION, our processing department will qualify you for the special offer. Hurry before this special is over and you have to pay regular price for your application - $177.45 – Don’t Miss This Offer. Spend less today and if you are not satisfied, simply return for a refund. If you have any further questions, please feel free to contact me.



· Improved Fuel Economy (1 – 2.5 mpg)
· Increased Octane or Cetane
· Improved Performance – Horsepower & Torque
· Allows vehicles requiring premium fuel to operate on at least 1 or 2 grades lower w/o sacrificing performance (saves .20 - .40 cents per gallon)
· Reduced Emissions (less oil changes per year – cleaner oil) (Can save $25.00 - $100.00 per year depending of oil change frequency)
· Reduced Maintenance
· Warranted for the lifetime of any car or light duty diesel truck
· 90 day money back guarantee

Do your part to save energy and reduce pollution in your community

Join The Fitch Green Team!!!

If you experience any website difficulties please call our toll free number 888-881-2774.

Take care,

Robert Andrighetti
Customer service/Tech Support
Advanced Power Systems Int'l
Toll free 888-881-2774
Direct 860-496-7776
Fax 860-496-7626
www.fitchfuelcatalyst.com

 

I can confidentially say that I get 13mpg on average.

 

I consistently get about 20MPG...mostly highway/suburban driving.

Highest: 21.9MPG
Lowest: ~16MPG

 

I do little to no highway driving. I get 16 MPG on average. Some weeks it's 15, some weeks it's 17.

16 AVG.

Once I did all highway driving on a road trip. I got 20.5. That's my record.

I don't shift at 2k though. I shift between 5-7 on average. I almost never shift below 5k unless the car isn't warm yet. I'd rather get low mpg then carbon build-up or not have fun while driving.

Sabo- This thing doesn't sound like a good idea to me. I wouldn't add something like this without experienced users weighing in on their results. Horsepower TV doesn't really count. A lot goes on behind the scenes, and their test wasn't long term. If you want to be a test subject, no one would fault you, but that's a considerable gamble.

 

I get 17-18 mpg around town driving (60% city/40% country driving) and 23-24 mpg on highway driving. I think I can get 24-25 mpg if I do 100% cross country highway road trip. I'm pleased -- but sure would like to get more or be able to use 87 octane without lose of performance. I'm not a granny driver, but also not super aggressive.

I'm interested in hearing more about the Fitch Fuel Performance Device. Would like to hear from those who have the technical expertise give their thoughts. I'm leary of the manufacturer making claims.

 

Hard cold facts attached for 2004 MT purchased 46 months ago:

• Purchased 1,661 gallons of Shell 93
• Average price paid: $2.52 a gallon
• Total fuel cost: $4,190
• Total mpg 20.4
• Fuel cost per mile .124 cents

Cheers,
Oranje

 

hey guys just signed up tp the site i bought my rx8 used with about 50 k on it, im noticing terrible gas milage. It has standard tanks at 15.9 gal tank but i can only drive about 100 miles on the tank......seriously whats the deal??? whats wrong do i have a hole in my tank or what? Anyone knows anything the input would be great!! Thanks

 

Does anyone know if the newer ECU flashes are helping MPG at all?

Or the canzoomer maps, i've heard some of those can help MPG maybe not AMAZINGLY but still 2-3 mpg is significant.

 

LOL @ post.

 

I just came back from NC to FL. 2004 with 57K, premix.
Highway driving avg 90mph, 19.7MPG.
Highway driving avg 80mph, 21.7MPG
I did this going up and coming back, numbers were almost identical +/- .1MPG (80MPH through FL/GA, 90MPH through SC/NC).
Mixed 'spirited' driving I get 17~18MPG in FL.

Just my numbers,

A

 

The highest i ever got on a full tank was 238 before the light came on, that was when i first got the car, now ive been getting about 200 miles before the light comes on. I'm hoping that the tune up that im going to get soon will help. I just want 220 and ill be happy.

 

tank #1: 200 miles (70% highway, 30% city) - drove 20 miles after light came on
tank #2: 160 miles (50% highway, 50% city) - drove 15 miles after light came on

--- installed k&n air filter, royal purple 5w30 motor oil, msp16 flash ---

tank #1: 255 miles (70% highway, 30% city) - drove 20 miles after light came on
tank #2: will know at the end of the week!

so i've been hovering in the 16-17mpg area.. sucks

 

I think the six-speed automatic in my RX-8 is the reason my car gives more miles per gallon than most RX-8s - it is programmed for fuel economy over performance. I see this every day when I drive in auto mode and the tranny goes into 6th gear at less than 45 mph with a light load. At 60 mph, the revs are right at 2K which means a downshift with any push on the loud pedal, but also low rpms gives greater fuel economy while at a steady cruise speed.

My commute is 26 miles: 11 miles in the suburbs with eight stops, average, and 15 on urban highways that are usually moving bumper-to-bumper. The highway miles are usually in a lower gear, like 35 mph in third, then 40 in fourth, then back to 20 in second, then maybe back up to 45 in fifth, etc. Not really a highway cruise, more like constantly up and down through the gears while the traffic density and speeds vary. I do all this in manumatic mode, of course.

So my mpg has been averaging 24 or almost since I bought the car new last December. I run 15W-50 Mobil 1 (I like the additives) and 8 oz of MMO every 10-12 gallons. We'll see what the high summer temps bring, but so far I'm more than satisfied with my RX-8 fuel economy.

 

Was keeping track since I got my reman engine, but just lost interest this week heh. This is what I've gotten over 5.5 months and 6k miles; came out to 15-16mpg for 70c/30h.

 

When I bought my 04 manual 6 months ago I was getting avg 16 mpg and 200-240 miles per tank using premium gas at random stations . Last month I switched to exclusivly Shell premium and took my 8 across the state, I took a detour to hit a 15 mile stretch of road along a river and pushed it (really hard) the whole way. On the way home I got 21.6 mpg and well over 300 miles to the tank for the first time ever. I thought it wouldn't last and was just cause it was all highway but I have been getting 20+ mpg ever since I got back driving the same roads and style as before.

Take what you want from that story but my recommendations are Shell premium and a good stretch of hard driving once in a while.

 

I average 16-19 mpg in town...now I have come to find out that I get better gas mileage on the highway running 80 mph than I do going 70. At 70 mph on long trips I average 22-23 mpg, now at 80 I usually can pull out 25+ mpg. I did manage 341 miles out of one tank on my last trip to Mid-Ohio. Also, I haven't checked any AFR numbers but I think the engine leans out just enough at 80 mph to increase my mpg's.

 

With just over 126,000 miles my overall average is 21.1 MPG. Since changing the coils, wires and plugs, that's now grown to above 22 MPG (that consists of 18,000 miles). The only issue I have with the car is over the last 10,000 miles it is difficult to start when hot. I pulled the plugs today to examine them (replaced in Feb 08) and noticed one of the insulators was cracked. New plugs on order.

Thanksgiving day drive To/From Houston (about 280 miles from where I live) gave me 23.98 MPG.

 

figured that i would add my input here... I fill shell 89 or 91 only.

Mixed driving city/freeway, easy/hard and I have seen between 14.5-18 mpg. This is with a stock 06 GT. Most of my commute is freeway to and from school. I usually hit it on the onramp. I tend to average 1 mpg better with 89.

 

Annual update after five years for 2004 Grand Touring MT purchased 60 months ago:

• Purchased 1,912 gallons of Shell 93 exclusively
• Average price paid: $2.66 a gallon
• Total fuel cost: $5,083
• Total mpg 20.4
• Fuel cost per mile 13.1 cents
• 488 gallons per 10,000 miles

Cheers,
Oranje

 

Thanks for sharing. Averaging 18 mpg now with the winter gas mix. I plan to add an exhaust next year to see if that improves any.

 

I got 8 miles a gallon for two or three tanks of gas. I was forced to use 92 octane BP in a very hilly area in winter. Besides that, I have averaged 14-15 mpg . 2004 AT with around 21,200 miles

 

Ethanol free fuel better for engine? Better mileage?

 

15.5

50-50 highway, but fast as hell and never let it drop below 3K RPM. I also engine brake, a lot. What the hell, the car is not much fun short shifting at 2K. If I wanted good gas mileage I would have bought a Miata.