Old gas in tank, what to do?

if it's running fine, i would jus keep adding fresh gas as you use it.

 

Takes way more than a year for gas to go bad. Just drive off the remaining gas and fill back up with some super unleaded

 

You could of sold it to these folks but they just got busted: Contaminated gas sold across California for years, regulators say

 

In Canada Chevron 94 octane is straight gas. Check at the pump; there’s typically a decal saying that.

how often are you not driving, and for how long? How many kms do you put on it, say in a year? It could be you don’t need to do anything special.

 

Really? Are you sure?

Down here in US we call it "no-ethanol" or "non-Ethanol" gas and you can only get it at a very small number of gas stations in only a few states.

 

Incorrect... Even if Toyota makes that claim in their PluginPrius owners manual JDM has made it clear what the studies have shown:

"The length of time fuel will remain useable in your gas tank is dependent on the fuel type. Regular gasoline has a shelf life of three to six months, while diesel can last up to a year before it begins to degrade." Ref: How Long Can Gas Sit in a Car Before it Goes Bad?

Of course diluting old gas with new gas is probably the most common way people dispose of it.

 

10 kms weekly, say 500k yearly? Keep it on a charger possible?

 

I was, but checking just now, looks like in the last year or so federal regulations nixed it, all levels have some ethanol.

 

Just drive the dang car until you run out of gas if you want then pour in some fuel whatever it is you're going to be using and that'll be that pretty uneventful. Down here in the United States I run sheets blue fuel whatever that is 88 octane got ethanol in it blah blah blah been running it ever since it's been available never had a problem with a Prius and gasoline yet That's the least of the problems with the Prius is the gasoline everything else will fall around the car on a generation 3 but fuel will be the least of your problems and a generation two probably never thought of until the gas tank goes bad or something happens back there You don't hear fuel talked about all that much so you should run it out or close to it I drive my twos until the flashing pip is flashing and then add about 25 mi to that just because so I know when I pull into the gas station I'm close to fumes I put 10.9 gallons in my 11.1 gallon tank or something similar I'm stretching that bladder out like a pregnant woman in the morning.

 

I would not run it below a quarter tank, and refill each time with premium gas. After 3 or 4 cycles of this the percentage of old fuel is basically 0. Gas loses some of it's "bang" over time and also gets contaminated by moisture in the atmosphere. Not so much the latter with the prius fuel system though. Anyway, if your fuel has lost 25% of the bang when you refil with 3/4 of really good gas a few times you should be fine. I had an old motorhome, gas was close to 10 years old. It was a bear to start on that stuff but it would run. I diluted it using this system and after 3 cycles it started fine and ran great.

 

I would not wait to drain most of the tank unless you’re going to do it all now.
Otherwise, the gas just gets older and risk goes up.
Mixing fresh gas every day or so is an antidote to stale fuel

 

Why would refilling with premium gas be better, say compared to regular? Not completely challenging this, but curious.

 

My vote, since no drivability issue, continue to drive till empty, then only add a 1/4 tank, drive again to empty, then fill.
I have no insights to Stabil et al and fuel staying in the tank a year.

FWIW.
I am guessing here, if there is no fuel tank drain plug it may be possible to remove the fuel line at the fuel injector rail so the fuel pump can be used to exit the fuel through this rail. No sure if you can "old school" siphon through the gas tank fill nozzle.

 

Well, general (unconfirmed) rumors have it that most premium grade gas has higher (better?) levels of detergent additives.

Posted via the PriusChat mobile app.

 

Higher octane is less prone to pre ignite fwiw.

 

My t

My theory is averaging octane numbers. And also the theory that premium gas from certain suppliers has better cleaning chemicals. Sunoco 93 is my favorite, ignore the price and just use it once in a while. I have no scientific data on this.