If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#21
|
|||
|
|||
On Sat, 25 Jun 2005 19:48:14 GMT, "No Spam" > wrote:
>"Newbie" > wrote in message ... >> It may seem like a superfluous question, but what is the best way of >> calculating what mmg yuor vehicle is getting? I have my miles reading >> of course, and I can record how much gas I put in, but there was some >> gas already there in the tank, and how do I know what was traveled on >> how much gas? If you have a good system, please share! > >Amazing. Our educational system on display. I was amazed the other day when I had a chance to work with a brother (16) and sister (14) at a concession stand. They both would have worked circles around almost every adult that works there. Oh, the reason - parents own a store. |
Ads |
#22
|
|||
|
|||
Newbie wrote:
> It may seem like a superfluous question, but what is the best way of > calculating what mmg yuor vehicle is getting? I have my miles reading > of course, and I can record how much gas I put in, but there was some > gas already there in the tank, and how do I know what was traveled on > how much gas? If you have a good system, please share! You need to mark the milage at each fillup. Then take the gallons at each fillup. Take the milage since the last fillup (subtract previous fillup milage from current milage. Take gas you put in this fillup. This is the gas you put in, even if there already was gas in tank, and the milage you drove since then, so it doesn't matter how much was previously in tank. Then; miles PER gallon. PER means divide. So divide miles by gallons. Now, there are two trains of thought on how to handle statistics and accuracy. One thought is to take milage at beginning of several fillups. Now keep track of gas used in ten fillups, milage at last fillup. Divide cumulative milage by total of gas used. This MAY eliminate some small measurement errors. But, it yields no statistics by which you can measure accuray. I prefer calculating milage each time, for ten times. Average the ten readings. Now, compute variance. This is done by taking each individual milage calculation and subtracting average. Square the difference. Some all the squares. Now take square root of that sum. Sounds like a lot of work, but with calculators it is a two or three minute job. Now, the average you compute is only accurate to within this square root, with is the basic precision of your set of measurements. For instance, I tried ten tankfuls of regular, ten tankfulls of premium, to see which gave better accuracy. The value for regular was slightly bette than the average for premium, but the amount of the difference was only about half of the variance (that square root). Thus I could not conclude that regular actually gave me better milage- I have to conclude that they are the same within the accuracy I can measure my gas milage. |
#23
|
|||
|
|||
You're so harsh... LOL
|
#24
|
|||
|
|||
In alt.autos.toyota Ad absurdum per aspera > wrote:
> To the good advice given elsewhere in the thread, I would add, "check > your speedometer" (and thus your odometer). These things have some > intrinsic error, which might either stack up atop or the other > potential source of error: hanges you have made by tire/wheel size. While not an issue with my Toyota, I've had several vehicles where the odometer error is significantly less than the speedometer error. |
#25
|
|||
|
|||
|
#26
|
|||
|
|||
The very best way is to ALWAYS fill the tank everytime you get gas, then
divide the distance you went, 250 miles, by the new load of fuel, 12.5 gallons. The result, 20, is your miles per gallon. Fill the tank and reset the odometer (trip meter). I consistantly get just a bit over 25 mpg, so in 300+ miles I put in 12 gallons of gas, for just over 325 miles, I put in 13 gallons, for 275 miles, I get 11 gallons. It doesn't matter how much gas is left when you fill up. It does matter if you fill to the brim, or only fill to the first shut-off. I usually fill to the first shut-off, then top off to the next even dollar. I used to top off to the next even quarter, but gas is getting so expensive that topping to the next dollar is less than a half gallon, and this won't change your formula very much. So, you go to the corner today and buy gas. If you filled the tank to the top AND reset the odometer the last time you got gas, then you can divide the distance by the new load of fuel and derive the mileage. If you did not fill to the top and/or reset the odometer, then this tank will be your baseline and you can make no calculations from it. Then, in a week or so when you visit the filling station again, then you fill the tank and divide the distance by the fuel load. The result will be your mileage. If you go 250 miles and put in 10 gallons, then you got 25 mpg. All you have to do is always fill the tank, never just get $5.00, or whatever. If you do just get $5.00, then you have to add the gallons to the next fill up and leave the odometer counting as if you had not gotten the few gallons. After you do this a few times, you will be able to quickly calculate in your head to confirm that you are getting the same mileage that you always get. I get 25 mpg in my normal driving routine. "Newbie" > wrote in message ... > It may seem like a superfluous question, but what is the best way of > calculating what mmg yuor vehicle is getting? I have my miles reading > of course, and I can record how much gas I put in, but there was some > gas already there in the tank, and how do I know what was traveled on > how much gas? If you have a good system, please share! |
#27
|
|||
|
|||
"Kathy and Erich Coiner" > wrote in message news:byhve.1095$4M1.107@trnddc07... > 1. Fill Tank. Correct. > 2. Record mileage. Correct. > 3. Drive car till near empty. Sorta. Drive as long as you want and refill the tank anytime you want. > 4. Fill tank again. Use same pump at same station. Let the auto shutoff > system work. (Do this on initial fillup too. Record gallons to fill You make this much more difficult than it needs to be. All that is needed is to fill the tank where ever it is convenient to get gas. > 5. Record mileage. Correct. > 6 mpg= (mileage step 5-mileage step 2)/gallons used step 4. Correct. Repeat from Step 3. |
#28
|
|||
|
|||
Newbie wrote:
> It may seem like a superfluous question, but what is the best way of > calculating what mmg yuor vehicle is getting? I have my miles reading > of course, and I can record how much gas I put in, but there was some > gas already there in the tank, and how do I know what was traveled on > how much gas? If you have a good system, please share! Start with a full tank. record mileage. Drive. At next fill, record mileage and the gallons to fill back up. With my truck I just go to the first click. Your mileage will vary depending on the type of driving, the weather (-40 idling uses a lot of gas) etc etc... so just keep tracking it. I use a spreadsheet and track the average and the average for the last 10 tanks. I found the last 10 tankfuls to be a good indicator of my overall mileage. I moved to a more rural area so I spent less time in rush hour so the average mpg went up by a couple, but went back down in the winter... and went up a couple mpg when I finally changed the plugs and did a tune up. My truck usually averages around 12-16mpg with the odd highway drive above 20. Why the average? Because unless you drive the same road under the same conditions at the same speed with the same brand of gas filled to the same spot in the tank you're introducing all kinds of "error" into the equation. Averaging that over 10 tanks will give you a more "real world" mileage. If you have excel I can email you a copy of the spreadsheet... Ray |
#29
|
|||
|
|||
Newbie wrote:
> It may seem like a superfluous question, but what is the best way of > calculating what mmg yuor vehicle is getting? I have my miles reading > of course, and I can record how much gas I put in, but there was some > gas already there in the tank, and how do I know what was traveled on > how much gas? If you have a good system, please share! One normally assumes that the tank becomes equally full right after each fill-up. Therefore, all you need to do is reset your trip-odometer after each fill-up, but first, divide the number on it by the number on the pump. (In other words, the amount of gas you just put in equals the amount you used between the previous fill-up and this fill-up.) |
#30
|
|||
|
|||
Newbie wrote:
> > It may seem like a superfluous question, but what is the best way of > calculating what mmg yuor vehicle is getting? I have my miles reading > of course, and I can record how much gas I put in, but there was some > gas already there in the tank, and how do I know what was traveled on > how much gas? If you have a good system, please share! Ask your little sister, she'll help you. -- Cheers, Bev \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\ "He who joyfully marches in rank and file has already earned my contempt. He has been given a large brain by mistake, since for him the spinal cord would suffice." -- -Albert Einstein |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
How to compute mileage (mpg)? | Newbie | Driving | 41 | June 30th 05 02:33 PM |
High Mileage VW Bug Mileage | Paul Regal | VW air cooled | 51 | April 5th 05 07:36 AM |
New *FREE* Corvette Discussion Forum | JLA ENTERPRISES TECHNOLOGIES INTEGRATION | Corvette | 12 | November 30th 04 06:36 PM |
Dodge Magnum RT 2005 Real World Mileage | GRL | Dodge | 2 | September 24th 04 09:06 AM |