EcoModder Forum How to calculate MPG during a partial fill

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 03-17-2013, 04:36 AM #1 (permalink) EcoModding Lurker   Join Date: May 2011 Location: Santa Barbara, CA Posts: 65 Buddy - '94 Acura Integra GSR 90 day: 28.07 mpg (US) Thanks: 0 Thanked 1 Time in 1 Post How to calculate MPG during a partial fill I was running on E and was starting to get nervous about driving so I put in two gallons of gas instead of filling up. Now, how do I calculate my MPG after I fill up? Thanks! - Aaron How-To: When you do a partial-fill (meaning you didn't fill the tank, e.g. you only put in a few gallons) keep the odometer running and when you finally do fill up, add the gallons from the partial-fill to the full tank. If you put in two gallons then later fill with 10, add those two gallons to the fill-up to get a total of 12 and use that in your MPG calculator. Last edited by TheIVJackal; 03-19-2013 at 03:44 PM..
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 03-17-2013, 06:31 AM #2 (permalink) Eco-ventor     Join Date: Oct 2010 Location: sweden Posts: 1,574 Princess - '92 Mazda MX-3 GS House of TudorTeam Mazda 90 day: 53.54 mpg (US) Shirubāarō (*´ω｀*) - '05 Toyota Prius Executive Team Toyota 90 day: 54.88 mpg (US) Blue Thunder - '20 Hyundai IONIQ Trend PHEV Team HyundaiPlug-in Hybrids Thanks: 69 Thanked 651 Times in 412 Posts Just add the two gallons to whatever you put in later to fill the tank. (??) __________________ 2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US) 2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)
 03-17-2013, 09:18 AM #3 (permalink) The Dirty330 Modder     Join Date: Dec 2011 Location: North East Ohio, USA Posts: 642 CruzeRS - '15 Chevy Cruze LT RS 90 day: 41.29 mpg (US) Thanks: 10 Thanked 67 Times in 59 Posts dont reset your trip and make note of how many gal you added than add the gal to youro fill up __________________ "The only real mistake is the one from which we learn nothing." - Henry Ford
 03-17-2013, 04:11 PM #4 (permalink) EcoModding Lurker   Join Date: May 2011 Location: Santa Barbara, CA Posts: 65 Buddy - '94 Acura Integra GSR 90 day: 28.07 mpg (US) Thanks: 0 Thanked 1 Time in 1 Post But wouldn't that assume that I used two gallons by the time I fill-up? I was thinking more of finding out how much gas each mile uses and using that in some sort of equation?
 03-17-2013, 04:46 PM #5 (permalink) Master EcoModder   Join Date: Jan 2011 Location: na Posts: 1,025 Thanks: 277 Thanked 217 Times in 184 Posts It all works out, just add your part fill to next full fill, even if 5 of them, you'll get a high tank, but average mpg will work out, kind of like 3 tank MPG. You could put in th 2 gallons and tip OD and reset trip and it would all average out, but give crazy high tank MPG. Last edited by roosterk0031; 03-17-2013 at 08:45 PM..
 03-17-2013, 07:17 PM #6 (permalink) Master EcoModder     Join Date: Oct 2009 Location: Texas Posts: 3,523 The Q Sold - '02 Infiniti Q45 Sport 90 day: 23.08 mpg (US) blackie - '14 nissan altima sv Thanks: 2,203 Thanked 660 Times in 475 Posts get a scangaugeII. __________________ MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game." ECO MODS PERFORMED: First: ScangaugeII http://ecomodder.com/forum/showthrea...eii-23306.html Second: Grille Block http://ecomodder.com/forum/showthrea...e-10912-2.html Third: Full underbelly pan http://ecomodder.com/forum/showthrea...q45-11402.html Fourth: rear skirts and 30.4mpg on trip! http://ecomodder.com/forum/showthrea...tml#post247938
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Quote:
 Originally Posted by TheIVJackal But wouldn't that assume that I used two gallons by the time I fill-up?
NO.

What you already used up, you'll need to add again when topping up.
What's left in the tank, you won't need to add again

Keep the miles counter running until you fill up completely, and add the previous 2 gal to the volume you tanked - done.
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 03-19-2013, 03:23 PM #8 (permalink) EcoModding Lurker   Join Date: May 2011 Location: Santa Barbara, CA Posts: 65 Buddy - '94 Acura Integra GSR 90 day: 28.07 mpg (US) Thanks: 0 Thanked 1 Time in 1 Post Alright, it's starting to click in my head. So just to be clear, if the next time I fill up I pump 10 gallons, I want to add the previous two gallons to that correct? I'll have a total of 12 gallons that I will use to determine MPG for that tank right? I use the total OD mileage. Thanks!
 03-19-2013, 03:32 PM #9 (permalink) The Dirty330 Modder     Join Date: Dec 2011 Location: North East Ohio, USA Posts: 642 CruzeRS - '15 Chevy Cruze LT RS 90 day: 41.29 mpg (US) Thanks: 10 Thanked 67 Times in 59 Posts yes just make sure you dont reset your trip untill you fill completely __________________ "The only real mistake is the one from which we learn nothing." - Henry Ford
 03-19-2013, 03:41 PM #10 (permalink) EcoModding Lurker   Join Date: May 2011 Location: Santa Barbara, CA Posts: 65 Buddy - '94 Acura Integra GSR 90 day: 28.07 mpg (US) Thanks: 0 Thanked 1 Time in 1 Post Excellent, thanks!