Do you fill your car all the way to the top or the first click? I read somewhere it's bad for the car to fill all the way to the top due to vapor collection.
I always fill to the first click. I don't see a reason to fill beyond unless paying with cash and you want an exact amount. How much further will your car go with that little extra gas in the tank? Probably not much. And yes the vapors will expand as they are heated up. Thats why I always like to pump my own gas.
Yes, fill up to the first click. After that you are overfilling and with repeated overfilling you will damage emissions components.
Just step on the gas when when you leave the gas station and you won't have to worry much about how much gas is in the tank
On some cars, and I don't know that the Cayman is one of them or not, topping off during filling can cause fuel to be drained into the activated charcoal canister that holds gasoline tank vapors when the engine isn't running. Normally these vapors are then sucked into the engine with vacuum when the engine is running. If the charcoal canister gets saturated it can cause starting and/or driveability problems.
In general topping off your tank is a really, really bad idea. Modern fuel systems are sealed, and as you pump in fuel the air must escape through a vent that terminates in the filler neck. Cover the vent with fuel and the excess gasoline you're pumping in might squirt back at you.
Topping off falls into my "just don't" category. Here's in Oregonia, one of the two stupid states where you can't pump your own gas, I have to remind every attendant I know not to top off the tank. They like to round your purchase to the nearest whatever. Dumb behavior.
I worked at a gas station for four years while in college. When you top off the tank the back pressure that builds up causes the hose at the pump to fill up with gas. So you are actually paying for gas for the next customer.
Thanks for all the great responses. One click for now on. Whew I never knew it would be that bad on our engines.
Here is another factor to consider when buying gasoline. The cooefficient of expansion of gasoline is .000528 per degree farenheit. The gasoline stored in tanks below ground is somewhere between 55-60 degrees F (the government uses 60F). When gasoline is pumped into your car it depends on the temperature as to whether the gas will expand or contract. Remember that there is gasoline above the ground in the pump, hoses etc. That gasoline is at approximately what the air temperature is.
When the temperature of gasoline rises above 60 degrees, the gasoline expands but pumps don't account for the bigger volume and consumers receive less gasoline than they should. The technology to adjust for temperature has already been installed in Canada (since colder temperature gas costs the companies) but domestic oil companies have resisted because they made an extra $500 million in profits per year alone in California due to failure to adjust for gasoline temperature. Hawaii is the only state to adjust its pump calculations for hotter gas.
You can't pump your own gas??????? What's the other state with this ridiculous law? Why would they do this?? Did some of the Oregonian lawmakers have a stroke?
Shocking. Sounds like a class-action lawsuit in the making to be honest.
Here is something to consider. If you fill your tank yourself and fill slowly, just barely letting gas flow when you know you are getting near the end, the first click won't occur until the tank is a great deal more full, than if you set the pump handle with the small self holding lever gizmo.
How does that figure in on how to fill your tank? I hate to pull the handle, with gas going full blast and watch it click and fall off on the ground. Of course we know all Porsche owners hold the handle 100% of the time.
Bingo fill late at night or best early AM the gas will be at it's best as far as density. And slowly as not to airate the fuel {as little as possible} it is best. Do your fill up's when not pressed for time. Mine I have to watch out when I fill it slowly. I will have to stop and let the pressure bleed off. If not the pump will keep shutting off. At first thought it was trying to top off not the case. I would wind up with 3/4 of a tank. I learned to wait at least 5 sec or more then resume.
SLOW AND SURE DOES A FULl CAYMEN MAKE + YOU GET WHAT YOU PAY FOR
INSTEAD OF PAYING FOR LESS FUEL
