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SUVs Honda CR-V Honda CR-V Real World MPG
786 messages, Last post on Nov 26, 2009 at 3:53 AM
You are in the Honda CR-V Forum. Your Hosts are steve_ & tidester
Your Community Leader is varmint.
| ... 31.6. Got it on a trip through upstate NY last summer traveling from PA to CT. I stopped on Rt 17/84 (?) for gas, got right back on the highway, set cruise for 65 mph. 300+ miles later, pulled off at the Roscoe Diner and filled up at the station across the street. Tires were at 32 psi, there was approx a 500 lb payload on board and most of the 300+ miles were through mountains. My CR-V had about 4,000 miles on it at the time. | |
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Replying to: tidester (Jul 09, 2006 10:26 am) Please go back an re-read my post. The tank being heated will cause the fuel inside the tank to expand. A cool tank with cool fuel already inside it will accept more cool fuel than a hot tank with hot gas already inside it. If you heated the fuel tank itself enough to cause it to expand enough to make any difference in it's internal dimensions (volume), it would probably be on its way to an explosion. What you should be focussing on is the volume of gasoline you put into the tank and you get that information from the display at the pump. The volume will vary on temperature of the car's fuel tank, and placement of the car. Another factor is how the tank was filled. Some pumps are painfully slow while others move along at a good pace. Some folks prefer to fill until the 1st click off. When doing this, be sure you are at the same pump facing same direction with the same pump trigger setting. Ever notice how a fast nozzle will click off, then running it very slow will allow some more to be added? Sometimes as much as a gallon can still be crammed in. Fast moving liquids tend to pick up air which causes expansion. Then the air escapes and the liquid settles to a lower level. You can test this at your kitchen sink with water. Fill a plastic milk jug at full tap volume. As soon as the water and air mixture get to the top, (Which would shut off a gas nozzle) shut off the water. Watch the level settle. If no more water is added, the jug is not full. Now do the same thing with the water running much slower as the level nears the top. It may fill to a point that there is very little or no settling. Kip
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Replying to: kipk (Jul 12, 2006 6:28 am) That's a matter of heat capacity. Since the mass (weight) of the gasoline you're putting into the tank is greater than the tank itself the final temperature of the tank + gas will be closer to that of the gasoline. Of course, both will eventually reach ambient temperature - long after you have filled your tank. Again, you should be focussing on your total miles and volume of gasoline pumped. Take a look at the article Steve cited - as soon as we get the link straight!  tidester, host
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Replying to: tidester (Jul 12, 2006 12:27 pm) Try this one: Question of the Day - Is Cold Gas More Dense? Part 2 Steve, Host
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Replying to: steve_ (Jul 12, 2006 1:48 pm) tidester, host |
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Replying to: tidester (Jul 12, 2006 12:27 pm) That depends on how much is added during the fill up. Driving on blacktop roads the gas and tank can reach very high temperatures. But let's just say the gas temp is 100. The tank holds 20 gallons and it takes ten to fill it with gas that is say 65 degrees from an underground tank. During that fill up the average in the tank will be 80+ degrees. Park the car and the next morning you will be able to add more gas. I believe that everyone that reads these post can remember a time or two when they filled the tank late the day before and the next morning it was not quite on the full mark or fell off very quickly. It is all the little things that add up to make a difference from tank to tank. For instance, one afternoon recently I stopped and filled the tank on my Pilot. It took about a half a tank. (10 gallons) The temperature was near 90 degrees and I had been running on blacktop roads. No doubt that the tank and the gas in it were hot. I put about 20 miles on that tank before arriving home. That night my wife decided that we were going to take a 300 mile trip the next morning. We left about 7am. The temperature was in the middle 60s. About a mile from my house is a service station. I wanted a full tank for the trip to check mileage. It took 2.1 gallons to top it off. So for that 2.1 gallon tank I had gotten 9.5 miles per gallon on 20 miles of back roads driving 55 mph with no traffic.  So what happened? On the day before, It was hot and I most likely sat in the car while it filled at high pump speed. When it clicked I removed the hose. Chances are good that I could have squeezed another gallon into the tank just from the gas settling. The next morning the tank and the gas in it was 25-30 degrees cooler than the day before, prior to adding fuel. I was also at a different pump at a different station. Under ideal and very similar conditions, mileage figures will vary from tank to tank. How it is filled, when it is filled, and angle of the car can and will make a difference from tank to tank. Over the long haul and several tanks of gas, things will average out to a true overall MPG. However, for tank to tank readings, care must be taken. That's my story and I'm sticking to it! Kip
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Replying to: kipk (Jul 12, 2006 4:09 pm) Good! I'm sure we glazed over a more than a few eyeballs with our talk about thermal expansion coefficients.  Carry on! tidester, host
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Replying to: tidester (Jul 12, 2006 6:01 pm) It sure wore me out!  Have a blessed day ! Kip
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Replying to: kipk (Jul 13, 2006 12:14 pm) 'Hot' fuel costs billions (Star-Telegram)
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