is it true that a full tank gives better mileage? - Page 4 - Fuel Economy, Hypermiling, EcoModding News and Forum

gasti_ako · 09-12-2008, 12:56 AM

thanks for your replies.

I guess vapors would come out on your next fill. You'll notice that a tranparent smog comes out of your tank once you opened it for refueling. Also, if you make your tank empty, the more times you will go to the gas station. The more miles you'll spend. In addition, contaminants are settled at the bottom of the fuel tank. If you make your tank near empty, your engine will be susceptible to these contaminants.

The best way is to test it as what have been advised. Any more tests guys?

Clev · 09-12-2008, 03:05 AM

Quote:

Originally Posted by PaleMelanesian

750 daily commute segments included in this.
11.9 gallon tank = 83 (ish) lb of fuel, assuming the above 7lb / gal is correct.
3.6% of my car's total weight (2300 lb).
6% improvement in mileage.

There must be something more going on. If removing 61 pounds (75% of 83ish pounds) increased my mileage by 6%, I'd be ripping out the extra seats, interior and dash right now... and then going on a diet.

happyface · 09-12-2008, 04:16 AM

You don't have to be a genius to figure out that more weight means that you will burn more gas, what does a full tank weigh???? DUH!

Clev · 09-12-2008, 04:43 AM

Quote:

Originally Posted by happyface

You don't have to be a genius to figure out that more weight means that you will burn more gas, what does a full tank weigh???? DUH!

About 80 pounds. DUH!

BlackDeuceCoupe · 09-12-2008, 04:59 AM

Quote:

Originally Posted by Clev

About 80 pounds. DUH!

Depends on the vehicle...

In my ride - the difference between 'F' and 'E' is 48 lbs.

Maybe it helps my FE by coasting further...

Quote:

Originally Posted by Doofus McFancypants

Item #4 - I have found that filling it on SLOW seems to work better for my car - maybe it is how the pipe is bent - but on HIGH flow it will click itsself off Way Early....

LoL!

Takes me about 10 minutes to fill my tank - hurts my back from bending over so long, but I think it makes a difference!

Geebee · 09-12-2008, 05:18 AM

Alot will depend on the car, a full tank on mine is 5% of total weight, definately noticable, you can feel the difference on steep climbs and drag racing

Vince-HX · 09-12-2008, 05:58 AM

Imo small changes of weight wont have an much of effect on the average driver. PaleMelanesian is really pushing his civic with few modifications, I'm seriously impressed.

In my case, the best FE I have ever had was when there was 150+ extra lbs in the car.