Toyota Prius Owners Manual

OPERATION OF INSTRUMENTS ANDCONTROLS / Information before driving your Toyota / Fuel


Your vehicle must use only unleadedgasoline.

To help prevent gas station mixups, yourToyota has a smaller fuel tank opening.The special nozzle on pumps with unleadedfuel will fit it, but the larger standardnozzle on pumps with leaded gas willnot.

At a minimum, the gasoline you useshould meet the specifications of ASTMD4814 in the U.S.A. and CGSB 3.5−M93in Canada.


Do not use leaded gasoline. Use ofleaded gasoline will cause the three−way catalytic converter to lose its effectivenessand the emission controlsystem to function improperly. Also,this can increase maintenance costs.


Select unleaded gasoline with an OctaneRating of 87 (Research OctaneNumber 91) or higher.

Use of unleaded fuel with an octane ratinglower than 87 may result in engine knocking.Persistent knocking can lead to enginedamage.

If your engine knocks...

If you detect heavy knocking even whenusing the recommended fuel, or if youhear steady knocking while holding asteady speed on level roads, consult yourToyota dealer.

However, occasionally, you may noticelight knocking for a short time while acceleratingor driving up hills. This is normaland there is no need for concern.


Toyota recommends the use of gasolinethat contains detergent additives toavoid build−up of engine deposits.

However, all gasoline sold in the U.S.contains detergent additives to keep cleanand/or clean intake systems.


Automotive manufacturers in the U.S.,Europe and Japan have developed aspecification for quality fuel namedWorld−Wide Fuel Charter (WWFC) thatis expected to be applied world wide.The WWFC consists of four categoriesthat depend on required emission levels.In the U.S., category 4 has beenadopted. The WWFC improves air qualityby providing for better emissions invehicle fleets, and customer satisfactionthrough better vehicle performance.


Cleaner burning gasoline, including reformulatedgasoline that contains oxygenatessuch as ethanol or MTBE isavailable in many areas.Toyota recommends the use of cleanerburning gasoline and appropriately blendedreformulated gasoline. These types of gasolineprovide excellent vehicle performance,reduce vehicle emissions, and improveair quality.


Toyota allows the use of oxygenateblended gasoline where the oxygenatecontent is up to 10% ethanol or 15%MTBE. If you use gasohol in yourToyota, be sure that it has an octanerating no lower than 87.

Toyota does not recommend the use ofgasoline containing methanol.


Some gasoline contain an octane enhancingadditive called MMT (MethylcyclopentadienylManganese Tricarbonyl).

Toyota does not recommend the use ofgasoline that contains MMT. If fuel containingMMT is used, your emission controlsystem may be adversely affected.The Malfunction Indicator Lamp on the instrumentcluster may come on. If this happens,contact your Toyota dealer for service.


In a very few cases, you may experiencedriveability problems caused by the particulargasoline that you are using. If youcontinue to have unacceptable driveability,try changing gasoline brands. If this doesnot rectify your problem, then consult yourToyota dealer.


  • Do not use gasohol other thanstated above. It will cause fuel systemdamage or vehicle performanceproblems.
  • If drivability problems are encountered(poor hot starting, vaporizing,engine knock, etc.), discontinue itsuse.
  • Take care not to spill gasohol duringrefueling. Gasohol may causepaint damage.


45 L (11.9 gal., 9.9

The given fuel tank capacity is measuredon EPA/CARB ORVR testing conditionwhich is approved for nominal capacitymeasurement condition.

The fuel tank capacity is decreased at lowambient temperature. (decreased by about5 L (1.3 gal., 1.1 at −10 C(14 F).)

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