KLH Report post Posted October 27, 2013 (edited) I suppose that this is obvious, but I've confirmed that overfilling the fuel tank will cause a drop in MPG. I usually achieve 43+ MPG on trips less than 15 miles. After DTE was 14 mi, I decided to try overfilling (going beyond 2 clicks). First click was at 10.5 gallons. When I stopped, I had 12.5. On the two subsequent 8 mi trips, I achieved 38 and 37 MPG. Stating the obvious, dragging more weight impacts MPG. I assume that this is balanced when the fuel tank is near empty because I typically get fantastic MPG then. Edited October 27, 2013 by KLH Quote Share this post Link to post Share on other sites
TX NRG Report post Posted October 27, 2013 A gallon of gas weighs around 6 US pounds so overfilling by 2 gallons adds 12-13 pounds which should have a minimal effect on MPG, all else being equal (same gas blend, air temp, tire pressure, wind speed, route taken, engine & battery temps, traffic, etc.). A 10 degree decrease in air temp will decrease MPG more than adding 10 pounds in weight. 2 B25Nut and hybridbear reacted to this Quote Share this post Link to post Share on other sites
KLH Report post Posted October 27, 2013 There IS a cold snap happening in the northeast now. Maybe I mixed up my factors... 2 GrySql and hybridbear reacted to this Quote Share this post Link to post Share on other sites
GrySql Report post Posted October 27, 2013 Maybe I mixed up my factors...I am guilty of that every now and then as well... Some people claim I'm having 'senior moments'. :idea: 1 hybridbear reacted to this Quote Share this post Link to post Share on other sites
KLH Report post Posted November 5, 2013 I've now (over)filled my tank twice and have experienced better gas mileage... In short, colder weather was/is a bigger factor in the determination of gas mileage than the (additional) weight of the tank. Quote Share this post Link to post Share on other sites
B25Nut Report post Posted November 6, 2013 It's just a rumor, but I've heard that Hybridbear and his wife are on a crash diet to improve their MPG even more. 3 MaineFusion, acdii and hybridbear reacted to this Quote Share this post Link to post Share on other sites
GrySql Report post Posted November 6, 2013 Now that you mention the avoirdupois angle, I think you may have found my mpg problem - my personal over-filled tank. ;) 2 hybridbear and corncobs reacted to this Quote Share this post Link to post Share on other sites
acdii Report post Posted November 6, 2013 Hmmm so if what you two are saying, I should leave the wife to get to work her own way? Somehow I dont think that will go over well, but thats just me. 1 hybridbear reacted to this Quote Share this post Link to post Share on other sites
KLH Report post Posted November 6, 2013 It didn't work out so well for me this morning either. Take a look at my new bed! 3 MaineFusion, Toz and hybridbear reacted to this Quote Share this post Link to post Share on other sites
GrySql Report post Posted November 7, 2013 Hmmm so if what you two are saying, I should leave the wifeMust be some misunderstanding, I was only referring to myself.I could stand to lose the equivalent of a donut spare tire - pun intended. 1 hybridbear reacted to this Quote Share this post Link to post Share on other sites
GrySql Report post Posted November 7, 2013 It didn't work out so well for me this morning either.Take a look at my new bed!That's too much information..... :sandman: 2 corncobs and hybridbear reacted to this Quote Share this post Link to post Share on other sites
acdii Report post Posted November 7, 2013 :rating: 1 corncobs reacted to this Quote Share this post Link to post Share on other sites
hybridbear Report post Posted November 7, 2013 It's just a rumor, but I've heard that Hybridbear and his wife are on a crash diet to improve their MPG even more.Hahaha! Maybe the 40 lbs I've lost in the last year are part of our improved MPG. Now I only have a few more to go and I'll be back down to what I weighed when I was in High School. 1 corncobs reacted to this Quote Share this post Link to post Share on other sites
acdii Report post Posted November 7, 2013 uh huh, now we know how you are getting so good mPG, You are out there pushing the car as part of your fitness routine! Been out to see Coach, eh? :) 1 corncobs reacted to this Quote Share this post Link to post Share on other sites
