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01-22-2013, 08:52 AM | #3101 |
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I mostly notice it with 1/4 tank or less it takes more gas to maintain the same speed. I cant explain it myself.
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01-22-2013, 10:07 AM | #3102 |
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I've noticed it too. On other cars as well. The first half of the tank gets you a lot more miles than the second. My dad explained why to me at one point. Can't remember. He also was adamant about not letting the gas tank get below 1/2 full & that was one of his reasons why.
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01-22-2013, 10:18 AM | #3103 |
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An explanation for the mpg issue is your car has more momentum with a full tank. Aerodynamics matter less when your car weighs more and you are traveling at a constant speed. Js.
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01-22-2013, 10:32 AM | #3104 |
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Just a wild guess but maybe it could have something to do with the smaller amount of gas and the EVAP system / charcoal vapor canister. The system was designed to reduce pollution and draw fuel vapor into the engine to increase fuel efficiency. As the fuel level decease, the concentration of vapors decrease and the mpg's decrease. Feels like I'm grasping at straws, lol.
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01-22-2013, 10:34 AM | #3105 | |
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Quote:
And the main reason many people fill their tanks at around the 50% point is to avoid the accumulation of condensation in the tank. This is most important in the winter time. |
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01-22-2013, 10:13 PM | #3106 | |
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On an ideal flat and level road there will be no difference once the vehicle is up to speed, except rolling resistance, which is a minor consideration. Someone here had some stats on that - maybe the Commander. I have noticed the dash gauge is a little more optimistic when the tank is fuller though - are you reading off the dash gauge or actually miles/gallons at a fillup? |
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01-23-2013, 03:21 AM | #3107 | |
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01-23-2013, 04:26 AM | #3108 |
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By the time the fuel level gets low, some of the more volatile compounds in the fuel may have been boiled off and burned through the vapor system.
Additional weight hurts city driving more than highway, but it never helps. |
01-23-2013, 06:36 AM | #3109 | |
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01-23-2013, 06:47 AM | #3110 |
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01-23-2013, 07:17 AM | #3111 |
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Well ludicrous as it sounds to not be measured by volume, I've learned something new. The tank is NOT half full. http://auto.howstuffworks.com/fuel-gauge1.htm
Last edited by SleepNMnky; 01-23-2013 at 07:23 AM. |
01-23-2013, 07:19 AM | #3112 | |
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That's easy enough to check - fill it up when it's half full. It would be easy to alter the float measurement to adjust for that - I would find it difficult to believe Subaru doesn't do that. How about the dash gauge? I haven't noticed a big change with my Scangauge. |
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01-23-2013, 11:07 AM | #3113 |
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The MPG numbers are not based on the float.
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01-23-2013, 11:26 AM | #3114 |
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01-24-2013, 11:35 PM | #3115 |
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Do you mean when the gauge reads half tank it doesn't fill up to half the spec'd volume or what? What are you basing this on? Fuel gauge, tank fill vs. mileage, dash gauge, Scangauge (or similar) or what?
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01-25-2013, 06:23 AM | #3116 | |
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As for the dash puter, it does not calculate based on the float level. It uses the puter and bases its readings on fuel flow, extrapolating injector pulse, air temp, engine temp, rpm, etc. It is giving you numbers based on engine management parameters. John |
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01-25-2013, 06:43 AM | #3117 |
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I'm getting awfully sick of always having a headwind. On this tank I have only driven 3 times.
1. Monday, -5f, 20mph headwind home. 2. Yesterday morning, -10f in the morning, 15-20mph headwind. 3. Last night, +10f, 28 mph headwind. Now this morning when I leave it will be +1f, 35 mph headwind. Sigh. The wind need to stop switching every 12 hours from north to south back to north etc |
01-25-2013, 09:46 AM | #3118 |
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My gas mileage has sucked lately because it has been so cold! single digits or teens on my commute. I won't really be able to see if the reflash has helped until it warms up a bit. I do feel like the car is coasting better though, and also boggs down less, so I'm glad I had the reflash done.
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01-25-2013, 12:38 PM | #3119 |
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Yeah, mine too. Looks like Flyboy is dealing with conditions worse than mine though.
John |
01-25-2013, 01:39 PM | #3120 | |
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My Buick however in the same conditions is only getting 20mpg.... |
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01-25-2013, 03:12 PM | #3121 |
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sooooo.....yea im just going to put this right here http://forums.nasioc.com/forums/show....php?t=2427586
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01-25-2013, 07:53 PM | #3122 | |
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01-25-2013, 08:31 PM | #3123 | |
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01-25-2013, 08:38 PM | #3124 |
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i could use some money. so i suppose small claim law suits? then move our way up like the honda hybrid civic lady. and then bam! so who wants to do the petition?
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01-25-2013, 08:58 PM | #3125 |
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have to drive 90 minutes each way to a basketball tournament tomorrow with 3 other good size guys. curious to see how the wifes car will do carrying some beef!
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