EcoModder Forum How long to set a baseline?

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 05-24-2011, 05:21 PM #1 (permalink) Muscle Car Modder     Join Date: May 2011 Location: Nashville Posts: 117 QuikSilver - '00 Ford Mustang GT 90 day: 24.7 mpg (US) Thanks: 4 Thanked 7 Times in 6 Posts How long to set a baseline? Ive got a gauge on the way and I was wondering, how long or how many tanks is a good representation of your baseline MPG? Id like to get that before I start messing with ideas. __________________ 2000 Mustang GT 273hp/ 309ft.lbs. Cd 0.36 Im working on it
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 05-24-2011, 06:54 PM #2 (permalink) EcoModding Apprentice   Join Date: Apr 2011 Location: Houston Posts: 228 Thanks: 0 Thanked 23 Times in 17 Posts Depends how consistent your results are. If you get 15.3, 15.0, 15.2, then that is a good baseline. If you get 13, 17, 15, well, not so much. The more consistent you are beforehand, the easier it is to see, and to statisticall prove, a change.
 05-24-2011, 09:32 PM #3 (permalink) ...beats walking...   Join Date: Jul 2009 Location: . Posts: 6,191 Thanks: 179 Thanked 1,521 Times in 1,122 Posts ...mathematically, you need three data sets to average in order to obtain a meaningful "average" value (think of them as: one-too high, one-real, one-too low). ...statistically, you need 30 data sets to determine any (if they exist) trends or relationships.
 05-24-2011, 09:59 PM #4 (permalink) EcoModding Apprentice   Join Date: Apr 2011 Location: Houston Posts: 228 Thanks: 0 Thanked 23 Times in 17 Posts look up "delta test" and figure it out for yourself. the thought of you putting in 30 bad tanks just because old tele man says to just kills me.
 05-24-2011, 10:53 PM #5 (permalink) ...beats walking...   Join Date: Jul 2009 Location: . Posts: 6,191 Thanks: 179 Thanked 1,521 Times in 1,122 Posts ...uh, a "baseline" is a 'starting point' from which to compare 'new' data against, it's NOT used for trendline analyses! ...it's the "starting" line of a race, not the one-foot graduation marks around the field! ...I understood that he wants to establish his "starting" point mpg, so that he can accurately determine his ħmpg results, ie: what "worked" (produced +mpg) and what "didn't work" (produced -mpg). ...to determine if his rate of changes (ie: trendline!) is linear, curvilinear, etc., now *that's* when he'd need about 30 data sets. Last edited by gone-ot; 05-24-2011 at 10:58 PM..
 05-24-2011, 11:33 PM #6 (permalink) EcoModding Apprentice   Join Date: Apr 2011 Location: Houston Posts: 228 Thanks: 0 Thanked 23 Times in 17 Posts so what would your answer be to his actual question?
...beats walking...

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Quote:
 Originally Posted by Bill in Houston so what would your answer be to his actual question?
Quote:
 Originally Posted by Old Tele man ...mathematically, you need three data sets to average in order to obtain a meaningful "average" value (think of them as: one-too high, one-real, one-too low). ...statistically, you need 30 data sets to determine any (if they exist) trends or relationships.
...three for baseline, more (30) if he plans on making analyses or predictions (look-up student-t approximation to normal distribution)

...what he intends to do with the data in the future is the determining factor.

Last edited by gone-ot; 05-25-2011 at 10:22 PM..

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Quote:
 Originally Posted by Floordford Ive got a gauge on the way and I was wondering, how long or how many tanks is a good representation of your baseline MPG? Id like to get that before I start messing with ideas.
It might already be too late for a baseline.
The fact that you're registered here, is most likely already influencing your driving behaviour.
Seasonal changes can be rather large as well.

You probably have some idea of your mileage ?
Use that, and start messing right away
You'll see the MPG increase over time.
If you want to, you can then undo one of the mods and see how it influences your mileage.

Chances are it won't.
Removing my grille block didn't show up in the fuel log.

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Quote:
 Originally Posted by euromodder Removing my grille block didn't show up in the fuel log.
Did you reinstall it?
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 Originally Posted by sheepdog44 Transmission type Efficiency Manual neutral engine off.100% @∞MPG <----- Fun Fact. Manual 1:1 gear ratio .......98% CVT belt ............................88% Automatic .........................86%

 05-26-2011, 01:22 AM #10 (permalink) Muscle Car Modder     Join Date: May 2011 Location: Nashville Posts: 117 QuikSilver - '00 Ford Mustang GT 90 day: 24.7 mpg (US) Thanks: 4 Thanked 7 Times in 6 Posts Wow, im surprised at that. I hope I have different results. I plan on doing an upper grille block off, fog light area smoothing, headlight gap sealing and mirror removal. My thoughts about 30 tanks is that it might spill over into the "winter blend" that I guess gas stations switch to. Don't know if that would effect anything. Yes my driving habits have changed but I can easily go back to how I was driving before. I drive a Mustang GT and it is easy to wind it up to 3k before a gear change. Lately ive been shifting around 1,500-2,000. Plus skipping gears, neutral going down hill and even killing the engine in the neighborhood while using 5th gear with the engine off so I can still have power steering. Also doing 55-60 in 70mph highway areas. 5mph under most speed limits also. And because its free I took off my antenna and I keep my wipers in my car unless ran is predicted. __________________ 2000 Mustang GT 273hp/ 309ft.lbs. Cd 0.36 Im working on it