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Hi,
i ve been using scangauge for 2 years. However only recently i started to use it to demostrate fuel consumption. Trouble is that the trip and tank (especially thank) are different to those my OEM trip computer says. After 2 fillups i am wiating for this tank to reach the reserve fuel to refill and compare the values.
I suspect that the difference is in the way scangauge calculates the consumption compared to my oem trip computer. I thin that the trip computer calculates all the time a weighted average consumption where scangauge calculate just the average.

Notes
1. my car is a mercedes w203 c200 kompressor with the 2.0 liter M111 engine and manual transmision
2. I have changed my instrument cluster and installed a clk63amg item
3. the change affected my small distance consumption readings. With the old cluster when i turned the engine on the consumption (average not instantaneus) was 8,5l/100km and the clk item shows in the same condition 11.5. however both clusters are accurate and when i calculate the fuel that I will need to refill i always have the correct number.


Do I do anything wrong?
Today after 140km of in and around city driving I got 10.0l/100km on my trip computer and 10,9 on my scangauge. Sometimes scangauge reads more and others read less.

Greetings from Greece
Giannis

Ps: I ve put 2 fuel magnets and i ve been using aceton for the last 2000km. In my everyday trip to work i never made something better than 8.0liters/100km (with my old cluster) and 9.2 with my new. Aceton dropped the consumption with the new cluster to 8.1 and magnets showed an impressive 7,5.
Accordingly on my way back (much more traffic and up the hill) never did i show something less than 11,5-11,6 but yesterday i went home with a 10,5.

Mind you my car is not a stock one (pulley kit, headers and intercooler gave me 214hp from 163hp oem)


Ps2: i tried playing with the cutoff values to adjust the accuracy but no luck

Hi Giannisanag:

Let me put the Acetone use to bed. I can place a black cardboard shoebox at the intake of your Mercedes engine inlet and you will get better fuel economy through the placebo effect. The acetone and magnets are doing nothing for you but because you know "something" is there, your habits change ever so slightly which improves your fuel economy measurably.

When you fill, make sure you calibrate your ScanGauge with the More --> Fillup section and of course the speedo/odometer calibration to bring it in line with the actuals. It simply measures what it measures with no arithmetic added other than miles traveled/gallons consumed as converted from air into the intake at stoich.

And welcome to CleanMPG! While I have never been to Greece myself, my wife has and she said they drive absolutely “nuts” over there! Trying to hypermile amongst those norms is probably a royal pain and I wish you the best of luck :)

Wayne

i always hypermile on my way to work. this is way i am impressed with the acetone and magnet results. To put it clearly over the last 70.000km i only saw below 8 once despite trying very hard. Actually my trip to work is maily down hill the first and the last 2 kilometers which are mainly in dense traffic conditions. But the last 4 days low 9's in the city perimeter and high 7's out of it are redicusly easy to achieve.

As far as acetone and magnets are concerned i must add the following:
I do a hell of a lot of data logging. i love data logging and performance tests and i have bought pretty expensive equipment to do so. I also try to do my tests with as many factors stable as possible. Thus I can clearly state that with the exact same way of driving acetone gave me 8,5% improvement in fuel economy. it is clearly not the 15-20 percent the aceton supporters claim, but it is there in every fill up and it is not placebo. (the best way to convince myself was a tank full of gas with no aceton after the tests and the consumption returned. ) These results in my car. Performance gains or/and smoothening of the engine sound are not the case in my car.

With the magnets (mind you i have put 2 instead of 1. The seller claimed that with this big size I have bought one magnet is enough) i have not done any scientific test as with the acetone. However the rpm in idle dropped from 780 το 750 and this struck me as I said so it does SOMETHING. However I was not convinced about the fuel economy. When I put the second one on Thursday and filled up on Friday the results are the ones that I describe.

and as about driving in greece, we drive fast, we like fast and powerful cars but with the price of premium gas (98 or more octane) rising up to $1,5/l and IMF over our heads it is not very wise not to hypermile even if you are into tuning and fast driving like me.

http://www.cartalk.com/content/columns/Archive/2006/January/08.html