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216 Posts
Discussion Starter #1
The next time you fill up at the pump, you'll want to make sure that you don't fall for these myths. Save money, time and pointless worrying: These are common anecdotes we've heard from readers and our old-school, leaded-fuel-breathing elders.

Myth: Using premium gas will make my car perform better.

You're not going to do any good by filling up with premium gas if your car's manufacturer doesn't require or recommend it. There are rare instances where you may want to consider filling up with premium, but for the most part, today's computer-controlled vehicles can adjust an engine's performance in the majority of conditions. Some people may report pinging or knocking under heavy engine strain when towing or carrying a full load of people up hills. Modern knock sensors typically detect this pinging before you hear it, but if you do hear it, filling up with premium can help resolve it.

Myth: It's better to fill up in the morning or at night because you'll get more fuel.

We've heard this one for years. The reasoning is when the fuel is cooler, it's denser. A denser fuel will pack more energy in the same amount of space, so you'll get more bang for your buck. While density may change with temperature, underground storage tanks sit 15 to 20 feet below the surface so the fuel stays around 55 degrees Fahrenheit. Bruce Bragg, national account sales manager for fuel-dispensing equipment manufacturer Catlow and a 30-year engineer for a major oil company says one of the only times that you'll find a warmer, less-dense gas is if the fuel doesn't have time to cool off after being pumped into the underground tanks. Fuel temperature stabilizes quickly, so the chances of this making any difference are slim.

Myth: It's OK to top off your gas tank after the nozzle automatically shuts off.

Those few extra pumps after the nozzle automatically shuts off aren't worth the trouble, especially considering the fuel may just be rerouted into the station's storage tanks in some areas, according to the Environmental Protection Agency. You may also harm your vehicle's evaporative control system that prevents fuel vapors from escaping into the atmosphere. This system is designed to re-burn vapors, not liquid gasoline, that get pushed out of the gas tank when you fill up.

Myth: Pressing the fuel nozzle halfway will make you pay for gas you don't get.

This is a relatively new myth to us. And it is a myth. Dispensers have volumetric measures that can gauge whether they're pumping fuel slow or fast, Bragg said. It's not an on or off nozzle that can only accurately detect when the pump is going full bore. High-volume stations have their metering devices tested for accuracy by state and local regulatory agencies.

Myth: Using the wrong octane fuel will void my warranty.

It's not likely, but we wouldn't rule it out. Some automakers claim damage can be done to their vehicles' engines with prolonged use of the wrong octane gas. The owner's manual of the 2010 Acura RDX states, "The long-term use of regular-grade gasoline can lead to engine damage."

That's why we recommend carefully reading your owner's manual. Yes, it's big and intimidating, but there's a lot of valuable information within it. Will you likely void your warranty because you fill up with regular one time? No. Automakers that require premium, like the Acura RDX, acknowledge that a lower octane can be used in an emergency situation, but premium is strongly preferred.
Well i guess all those myths we used to follow and know about are false.. well according to Well a lot of it makes sense ad they actually did the research to find this all out.

141 Posts
Here's one of the emails i found:

I don't know what you guys are paying for gasoline.... but here in
California we are paying up to $3.75 to $4.10 per gallon. My line of work is
in petroleum for about 31 years now, so here are some tricks to get more of
your money's worth for every gallon:

Here at the Kinder Morgan Pipeline where I work in San Jose, CA we deliver
about 4 million gallons in a 24-hour period thru the pipeline.. One day is
diesel the next day is jet fuel, and gasoline, regular and premium grades.
We have 34-storage tanks here with a total capacity of 16,800,000 gallons.

Only buy or fill up your car or truck in the early morning when the ground
temperature is still cold. Remember that all service stations have their
storage tanks buried below ground. The colder the ground the more dense the
gasoline, when it gets warmer gasoline expands, so buying in the afternoon
or in the evening....your gallon is not exactly a gallon. In the petroleum
business, the specific gravity and the temperature of the gasoline, diesel
and jet fuel, ethanol and other petroleum products plays an important role.

A 1-degree rise in temperature is a big deal for this business. But the
service stations do not have temperature compensation at the pumps.

When you're filling up do not squeeze the trigger of the nozzle to a fast
mode If you look you will see that the trigger has three (3) stages: low,
middle, and high. You should be pumping on low mode, thereby minimizing the
vapors that are created while you are pumping. All hoses at the pump have a
vapor return. If you are pumping on the fast rate, some of the liquid that
goes to your tank becomes vapor. Those vapors are being sucked up and back
into the underground storage tank so you're getting less worth for your

One of the most important tips is to fill up when your gas tank is HALF
FULL. The reason for this is the more gas you have in your tank the less air
occupying its empty space. Gasoline evaporates faster than you can imagine.
Gasoline storage tanks have an internal floating roof. This roof serves as
zero clearance between the gas and the atmosphere, so it minimizes the
evaporation. Unlike service stations, here where I work, every truck that we
load is temperature compensated so that every gallon is actually the exact

Another reminder, if there is a gasoline truck pumping into the storage
tanks when you stop to buy gas, DO NOT fill up; most likely the gasoline is
being stirred up as the gas is being delivered, and you might pick up some
of the dirt that normally settles on the bottom.
To have an impact, we need to reach literally millions of gas buyers. It's
really simple to do.

141 Posts
Must have gottin rid of all the rest, but heres a gas boycott i also found:


This was sent by a retired Coca Cola executive. It came from one of his
engineer buddies who retired from Halliburton. If you are tired of the gas
prices going up AND they will continue to rise this summer, take time to
read this please.

Phillip Hollsworth offered this idea.

This makes MUCH MORE SENSE than the "don't buy gas on a certain day"
campaign that was going around last April or May!
It's worth your consideration. Join the resistance!!!!

I hear we are going to hit close to $ 4.00 a gallon by next summer and it
might go higher!! Want gasoline prices to come down?

We need to take some intelligent, united action.
The oil companies just laughed at that because they knew we wouldn't
continue to "hurt" ourselves by refusing to buy gas .

It was more of an inconvenience to us than it was a problem for them.
BUT, whoever thought of this idea, has come up with a plan that can Really
work. Please read on and join with us!

By now you're probably thinking gasoline priced at about $2.00 is super
cheap. Me too! It is currently $3.08 at Arco and Costco for regular
unleaded in Salem, Oregon and climbing every week.

Now that the oil companies and the OPEC nations have conditioned us to
think that the cost of a gallon of gas is CHEAP at $1.50 - $1.75, we need
to take aggressive action to teach them that BUYERS control the
marketplace..not sellers.

With the price of gasoline going up more each day, we consumers need to
take action.

The only way we are going to see the price of gas come down is if we hit
someone in the pocketbook by not purchasing their gas! And, we can do that
WITHOUT hurting ourselves.

How? Since we all rely on our cars, we can't just stop buying gas.

But we CAN have an impact on gas prices if we all act together to force a
price war.

Here's the idea: For the rest of this year, DON'T purchase ANY gasoline
from the two biggest companies (which now are one), EXXON and MOBIL.

If they are not selling any gas, they will be inclined to reduce their
prices. If they reduce their prices, the other companies will have to
follow suit.

But to have an impact, we need to reach literally millions of Exxon and
Mobil gas buyers.

1,377 Posts
What DaSik says about fuel temperature and so on is probably all correct, but is it practical and relevant? With the relatively small tank on a motorcycle it is not going to make a lot of difference. The way you ride / drive, and keeping your vehicle properly maintained can make more significant contributions.

So too can deciding whether or not to use your vehicle. Sure, we like to ride for the enjoyment of riding, but there are journeys that are neither fun, nor necessary. Minimise them.

216 Posts
Discussion Starter #6
It true they may be correct or wrong we dont know cause we've never actually seen a full scientific test.

As for filling a tank @ more than half, may also not be true due that we do have an evap box to release excess gas.

706 Posts
In the long run if you run higher octane / and higher quality fuel (Shell/BP/Marathon) the engine will stay cleaner and have less carbon build up. Will it hurt the bike to run lower octane fuel, not really but in the long run the carbon build up can cause problems. The carbon gets into the oil which on these things is also the gear box oil and used with the clutch. The carbon build up could cause pre mature clutch slippage, piston rings can seize, and oil flow can be decreased. One thing we do on cars is to do sea foam treatments or Fuel Induction services but running quality fuel can mean never having to do it.

You can also be sure that all the tests Honda does for oil change interval was done using high grade fuel. Running low grade means more fuel / carbon in the oil and having to change the oil more often. I will still be doing my oil changes every 3000 miles. In my years of experience it's just better and my dealer recommends it anyways (and they weren't in it for the money because they knew I would be doing the changes myself)
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