Toyota Prius HSD User Manual download pdf (Page 18)

NURTURING

Filling the Tank

Fill Speed

It is best to use the slowest setting (the farthest latch on the pump-handle); otherwise, the pump

could shut off prematurely giving you an inaccurate indication of "full".

Topping Off

Don't! Once the pump automatically stops, don't trying squeezing any more fuel into the tank.

More causes the bladder to stretch. Too much force will result in spitting out of fuel onto the

ground. So never, ever pump more than 12 gallons.

Also, pumping too much fuel into the tank will result in gas filling up the vapor-capture canister.

That defeats part of the emissions system. So if you want your Prius to remain the very cleanest

possible, avoid ever doing this.

Important Note: As with all vehicles, repeated flooding of the vapor-capture canister cause damage

to it… leading to eventual failure.

87 Octane Gas

Prius was designed to run with 87 Octane gasoline (85 in high altitudes). Several owners have

experimented with 90 & 93 Octane; however, there wasn't any improvement to MPG. Since engine

knocking is non-existent with Prius, there's no benefit in that respect either. Additionally, higher

octane may trigger an emission sensor alert. Therefore, save some money by using 87 Octane.

Low-Sulfur Gas

Without the loss of performance or power, low sulfur gasoline helps to reduce emissions by

preventing efficiency loss within the catalytic-converter (a pollution control device) due to sulfur

build up. This also extends the life of the emission components. All gasoline sold in the United

States was mandated to be low-sulfur beginning January 2006.

10% Ethanol

90% Gasoline blended with 10% Ethanol, better known as E10, will not harm any part of the Prius

fuel or emission system. Owners in Minnesota, where E10 is mandated by law, have used this type

of fuel in their Prius for many years without experiencing any problems at all. So there is no need

for concern.

Empty

Don't ever run out of gas!

Not having the engine available makes driving a Prius using just electricity very risky. Without

gasoline it is very easy to push the motor & battery-pack beyond the tolerances they were designed

to operate. The battery-pack is never supposed to be fully depleted, that shortens its life. Also,

without gas there's no way to prevent certain mechanical & electrical components (like the fuel

pump) from overheating. Since Prius can go quite a bit further between fill-ups than most vehicles,

there's really no reason you should ever run out of gas anyway. But if you do, drive very slowly

and just enough far to get out of harm's way then stop. Don’t keep driving.

Another Gauge

When there is less than half a tank of gas remaining, the gas gauge is less accurate due to the

flexible nature of the bladder within. A helpful measurement alternative is to base refill timing on

the mileage you drive. Just reset one of the three odometers (A, B, or the one on the multi-display)

every time you fill the tank.

450 miles (725 km) in the summer and 400 miles (644 km) in the winter is a good distance to start

with. You'll quickly figure out what works well for your particular needs.

Prius User-Guide 18 of 54 Last Updated: 9/01/2007

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Toyota Prius HSD User Manual Page 18

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