I always thought it was just people not knowing any better, but I drove for a week on a quarter tank, putting 5 dollars in every day. My in-car trip computer reported an average around 25MPG. Today I filled it to 3/4 and averaged 28. I always figured when the car weighs less (with an empty tank) it would get better mileage. Anyone know what's up with that?
2007-04-03 06:27:24 · 6 answers · asked by DaveW. 2 in Cars & Transportation ➔ Other - Cars & Transportation
The fuel gauge in cars are not a hundred percent accurate on the level readings....Some read a slower decrease in fuel level from the full to half a tank level...Others run down fast all the way to the quarter mark, and then they take forever to get to empty...
You actual fuel economy is totally dependant on driving habits from day to day..The only acurate way to calculate fuel economy is to fill your car up and reset the trip odometer..the next time you fill back up (actually fill up, not 5 dollor or gallons) divide the gallons of gas into the miles traveled..then you have an acurate fuel economy...
And remember you computer is calculating the average fuel economy on a false fuel level rating...That feature is only to get you in the ball park...
2007-04-06 13:37:17 · answer #1 · answered by Anonymous · 0⤊ 1⤋
There can be a lot of reasons for different fuel economy. The more wight you have the less the mileage, so a full tank would weigh more and you would get lower mileage.
The temperature could have something to do with it too. The warmer weather will let your engine warm up faster and then the fuel will lean out faster using less fuel. Like the choke opens up quicker. Maybe less stop and go driving and more highway driving.
There are a lot of factors to consider but having a full tank or a tank 1/2 full is not going to make that big a difference in the mileage. I would rather have the full tank, that way if I need to go somewhere quick, I don't have to stop for gas to get there.
2007-04-03 06:54:46 · answer #2 · answered by Fordman 7 · 0⤊ 0⤋
Actually your fuel efficiency would decrease on a full tank. But there are a lot of factors that could have increased your fuel
economy such as fuel quality, air temperature, and average speed of driving. fuel quality always affects fuel economy because different gas stations have different additives in there gas that either make a gallon of fuel burn faster or slower. Air temperature affects fuel economy because the cooler it is outside the less fuel is used because every gallon last just a bit longer because the air is denser therefore allowing the air/fuel mixture to burn longer. Average speed really affects the fuel economy. A car is most fuel efficient at 55 mph. At 35 mph you may lose up to 20% of your fuel economy that you would normally get at 55 mph. Same thing is true if you go over 55 mph. Hope this clarified things for you!
2007-04-03 06:49:05 · answer #3 · answered by yamaha_venom600 1 · 0⤊ 0⤋
although the adaptation could be negligible, a a million/2-empty tank might provide greater ideal miles in step with gallon. gas weighs greater or less 8 kilos in step with gallon. Assuming which you have a 10 gallon tank (an stunning, around, common, functional huge type), it might weigh 80 kilos finished and 40 kilos a million/2 finished. Getting all physics-y, friction (consequently, rolling friction) is proportional to weight, as a result wanting slightly greater pull from the engine to conquer the extra friction from the load of the fuller tank. the adaptation is so un-substantive nevertheless, that it truly does not count.
2016-11-25 23:27:05 · answer #4 · answered by ? 4 · 0⤊ 0⤋
Dont always believe what computers say it depends on your driving habits with a full tank you have to stop less often less stop and go motoring = better Mpg.
2007-04-03 08:43:38 · answer #5 · answered by mick 6 · 0⤊ 0⤋
no cuz u pulling $5 every day that is why you getting better MPG
2007-04-03 06:42:14 · answer #6 · answered by ayhankaygisiz 4 · 0⤊ 0⤋