RX - 3rd Gen (2010-2015) Discussion topics related to the 2010 - 2015 RX350 and RX450H models

RH 450H Fuel Tank and Tire Pressure

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Old 06-10-13, 10:26 AM
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RLM
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Default RH 450H Fuel Tank and Tire Pressure

I have a question.

The manual for the 450H does not agree with what I am experiencing.

1. The Manual says the fuel capacity is 17 gal, but with an empty tank the most I can put the tank is around 14 gallons. What is the real capacity, and why does the manual say 1y7 gallons.

2. For my 450H with 19 inch wheels the manual says tire pressure should be 33 psi.
However, when delivered from the factory the tire were 39 psi. What should the tire capacity be?

There seems to examples throughout the manual of conflicting information.

Comments?
Old 06-10-13, 10:57 AM
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wa3cuj
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Originally Posted by RLM
I have a question.

The manual for the 450H does not agree with what I am experiencing.

1. The Manual says the fuel capacity is 17 gal, but with an empty tank the most I can put the tank is around 14 gallons. What is the real capacity, and why does the manual say 1y7 gallons.

2. For my 450H with 19 inch wheels the manual says tire pressure should be 33 psi.
However, when delivered from the factory the tire were 39 psi. What should the tire capacity be?

There seems to examples throughout the manual of conflicting information.

Comments?
1. When your gauge shows empty there is always a couple of gallons left in the tank. I had the same thing happen to me when it would not show any miles till empty on the Nav and the gauge showed me running on fumes. Got off at the next exit on the PA Turnpike and could only squeeze 14.7 gallons into the tank.

2. I think that the manual is only a generalization. The sticker inside your driver's side door will have the number you want. The weight of the car will vary depending on options chosen and that should impact the pressure recommendation.
Old 06-11-13, 12:44 AM
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markrivers
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Originally Posted by RLM
I have a question.

The manual for the 450H does not agree with what I am experiencing.

1. The Manual says the fuel capacity is 17 gal, but with an empty tank the most I can put the tank is around 14 gallons. What is the real capacity, and why does the manual say 1y7 gallons.

2. For my 450H with 19 inch wheels the manual says tire pressure should be 33 psi.
However, when delivered from the factory the tire were 39 psi. What should the tire capacity be?

There seems to examples throughout the manual of conflicting information.

Comments?
what was your cruising range at this point?
what do you mean empty tank? needle on the E? below the E?

as wa3cuj have mentioned, there's a "reserve fuel" after the needle hits the lowest possible line below the "E" on the fuel gauge. Roughly 2 gallons, which is more than enough to drive to the nearest gas station.

IF you really want to measure your gas tank. DRIVE the RX to the ground, until the last drop of fuel. ( ideally in a parking lot) then start measuring.
Old 06-11-13, 04:39 AM
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That's not advisable on a hybrid. In the manual it states that running it dry can cause problems. When the computer tells the ICE (internal combustion engine) to start it's an instantaneous procedure. It won't work if there isn't any gas and pressure at the injectors. Doing that will likely result in a trip on a flat bed to the dealer. And it's not warranty.
Originally Posted by markrivers
what was your cruising range at this point?
what do you mean empty tank? needle on the E? below the E?

as wa3cuj have mentioned, there's a "reserve fuel" after the needle hits the lowest possible line below the "E" on the fuel gauge. Roughly 2 gallons, which is more than enough to drive to the nearest gas station.

IF you really want to measure your gas tank. DRIVE the RX to the ground, until the last drop of fuel. ( ideally in a parking lot) then start measuring.
Old 06-16-13, 06:10 PM
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billy44bo
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The tank will hold the larger amount of fuel however, you can not get all of it out of the tank. The fuel pump is in the tank and they use the gas to keep the pump from running hot or pumping dry.
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