Project Hypermile
08-27-08, 05:23 PM
#26
Wrkn Toyota, Rootn Wankel
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When you fill it up, you should keep filling it until you can see the gas in the filler neck. If the gas doesn't go down right away, it's full. This is what we do at work if a customer comes in and says they're doing a mileage check. (I'm 17 and pump gas to pay for my Seven
)
)No offense to you personally, but what you are doing and suggesting isa poor judgement call for the car in terms of emissions and the fuel system.
If you overfill the gas tank like that, you will end up saturating the charcoal canister and thus rendering the EVAP system next to useless in its primary function of collection evaporated gasoline fumes to recycle through the engine.
I know we normally don't give a crap about emissions since our rotaries tend to spew more than your average engine anyways, but something like that could be the one thing that fails your car at the next Smog Check.
Just thought I'd throw my two cents in.
08-27-08, 05:40 PM
#27
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I'm amazed no one caught this...
No offense to you personally, but what you are doing and suggesting isa poor judgement call for the car in terms of emissions and the fuel system.
If you overfill the gas tank like that, you will end up saturating the charcoal canister and thus rendering the EVAP system next to useless in its primary function of collection evaporated gasoline fumes to recycle through the engine.
I know we normally don't give a crap about emissions since our rotaries tend to spew more than your average engine anyways, but something like that could be the one thing that fails your car at the next Smog Check.
Just thought I'd throw my two cents in.
No offense to you personally, but what you are doing and suggesting isa poor judgement call for the car in terms of emissions and the fuel system.
If you overfill the gas tank like that, you will end up saturating the charcoal canister and thus rendering the EVAP system next to useless in its primary function of collection evaporated gasoline fumes to recycle through the engine.
I know we normally don't give a crap about emissions since our rotaries tend to spew more than your average engine anyways, but something like that could be the one thing that fails your car at the next Smog Check.
Just thought I'd throw my two cents in.
.Sorry for the bad suggestion.
08-27-08, 07:24 PM
#34
haha nah man, i just thought it was funny, i'd never get like near them man, they're way too freakin big, i've already gottened ran out the road by big pickups and small trucks that don't see me on the rear view mirrors while changing lanes so i try to stay away from semis lol.
08-27-08, 07:41 PM
#35
Water Boy
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Tailgating's right out. Illegal anyway.
A much safer thing to do with a semi is to just run alongside them and pick up their slipstream rather than the backwash. This is especially effective on high mountain roads with lots of wind. You can generally tell if it's windy if the driver of the truck is so inept he can't stay in one lane. /sarcasm off.
I'll be interested in seeing the results on this. I tried this early in the summer with my DD, using the 7 to satiate my want for speeds in excess of 60mph. I managed, by careful use of coasting, shutting down the engine, and climbing hills correctly to get to 41mpg instead of my typical 32. Then I decided it wasn't worth the trouble once gas dropped below $3.60. I'm still shutting the car down at red lights though. Get about 2mpg more that way so far, but only burned through 1 tank thus far.
A much safer thing to do with a semi is to just run alongside them and pick up their slipstream rather than the backwash. This is especially effective on high mountain roads with lots of wind. You can generally tell if it's windy if the driver of the truck is so inept he can't stay in one lane. /sarcasm off.
I'll be interested in seeing the results on this. I tried this early in the summer with my DD, using the 7 to satiate my want for speeds in excess of 60mph. I managed, by careful use of coasting, shutting down the engine, and climbing hills correctly to get to 41mpg instead of my typical 32. Then I decided it wasn't worth the trouble once gas dropped below $3.60. I'm still shutting the car down at red lights though. Get about 2mpg more that way so far, but only burned through 1 tank thus far.
08-27-08, 08:03 PM
#36
Play Well
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Maybe it just me (my dad used to drive a semi) but besides the rocks there wouldn't be a safer place to be than behind a semi. They have a better visibility, radios so they know whats up, and as long as you stay behind a big name company truck you dont have to worry about blowouts due to some newer regulations for companies to watch there tires and the big *** fine you get if a blowout was because of extreme wear.
As far as the amount of air the front or back gives off, there is a sweet spot on the side right beside the the 5th wheel hitch where the air is not as turblant. As for tailgating I have never had a ticket for it because you don't need to be that close to catch a lil air ride.
As far as the amount of air the front or back gives off, there is a sweet spot on the side right beside the the 5th wheel hitch where the air is not as turblant. As for tailgating I have never had a ticket for it because you don't need to be that close to catch a lil air ride.
08-27-08, 08:52 PM
#37
If I do "tailgate" a semi, which I admit I have done before, it was always where I can feel the back end wiggle around but not the front. That is usually 2ish RX lengths back. I can tell it is good in the front, my oil temps tend to creep up a few degrees. I remember when I first did this, I thought something was up, so I backed off, and it cooled down. Did this a few times and had a nice chuckle.
EDIT: I use the term "tailgate" loosely. More like slip streaming.
EDIT: I use the term "tailgate" loosely. More like slip streaming.
08-27-08, 09:08 PM
#39
I generally fill it up, then it starts clunking. I keep filling it until it clunks every 2 cents. Then round to nearest dollar.
08-28-08, 12:32 AM
#41
Water Boy
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Just remember to fill up early in the morning if you go bananas about it. The density of the gasoline is lower as it heats up, meaning you get slightly less gas if you fill at 3pm than if you fill at 5am, since the whole thing is metered by volume and not mass.
08-28-08, 01:29 AM
#42
^ haha that's awesome, never thought about it, but it makes sense, geez i guess i better go fill up right now since i can't sleep lol plus its raining so that should give me an extra 2 cents worth :P(2:30am for those of you in another time zone or w/e)
08-28-08, 09:57 AM
#43
Interesting project... I'm just thanking God I don't have to commute behind you. (lol)
I get enough grief from the %#&*@# Prius monkeys trying to squeeze an extra 0.05mpg out of their 'car' in the fast lane on the freeways out here... or on the one-lane canyon road I take home from work.
I get enough grief from the %#&*@# Prius monkeys trying to squeeze an extra 0.05mpg out of their 'car' in the fast lane on the freeways out here... or on the one-lane canyon road I take home from work.
08-28-08, 11:45 AM
#44
Rotary Freak
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Not just semis, but also many passenger cars are running around with burned out brake lights. Brake lights are very intense, using almost as much power as a headlight, so they burn out early, and most drivers never test them. So you find out about it when you find yourself mysteriously closing the gap with the car ahead and then doing a semi-panic stop!
08-28-08, 01:44 PM
#47
1. anything more than about 3ft below ground level, the temperature is almost constant. Doesn't matter what the outside air temperature is.
2. those tanks hold a tremendous amount of fuel. It would take a ton of energy to even move the temperature 1 degree
3. The gas pumps report gallons, but the fuel is really measured on a mass basis (density compensated flowrate).
Here is what Omega says:
Consider purchasing fuel for your car. How does a US gallon of gasoline purchased on a hot summer day in Las Vegas, Arizona compare with a US gallon of gasoline purchased on a cold winter night in Anchorage, Alaska? It was determined that a gallon is a volumetric unit, so logic would indicate that the same volume of gasoline was purchased. Yet the temperature difference would cause their densities, and hence their masses, to be different. Using this logic, more mass would be obtained by purchasing gasoline in colder weather. Thinking locally, one might conclude that it is more economical to purchase gasoline during the wee hours of the morning when the temperature is coldest.
As you might suspect, such is not the case. Gasoline pumps compensate for density variation that occurs due to temperature, and in doing so, they measure the amount (mass) of gasoline dispensed. Yet, a gallon of cold gasoline will occupy less volume than when hot. In essence, the measurement of a gallon of gasoline actually refers to its volume at a given temperature (such as 60 degF). As such, this is really a mass measurement unit because it refers to the flow of a specific substance at a given temperature, Returning to the quiz, let’s not be so hasty with the first three questions. They could be incomplete!
As you might suspect, such is not the case. Gasoline pumps compensate for density variation that occurs due to temperature, and in doing so, they measure the amount (mass) of gasoline dispensed. Yet, a gallon of cold gasoline will occupy less volume than when hot. In essence, the measurement of a gallon of gasoline actually refers to its volume at a given temperature (such as 60 degF). As such, this is really a mass measurement unit because it refers to the flow of a specific substance at a given temperature, Returning to the quiz, let’s not be so hasty with the first three questions. They could be incomplete!
