Según la política de combustible, el combustible está incluido.

Según means according to or based on.

In Según la política de combustible, it introduces the source or basis for the statement:

• Según la política de combustible = According to the fuel policy

It is very common in Spanish when you want to say that something is true based on a rule, document, person, or source.

Examples:

• Según el contrato, no hay reembolso. = According to the contract, there is no refund.
• Según el doctor, todo está bien. = According to the doctor, everything is fine.

Spanish often uses the definite article where English might not.

So:

• la política de combustible = the fuel policy

Even if English sometimes sounds fine without the in certain contexts, Spanish usually prefers the article here because it refers to a specific policy.

This is very normal:

• la reserva = the reservation
• el contrato = the contract
• la tarifa = the rate

Because the sentence is stating that fuel is included, and it also mentions the fuel policy as the source of that information.

So the two uses of combustible do different jobs:

• política de combustible = fuel policy
• el combustible está incluido = the fuel is included

Spanish often repeats nouns more freely than English does. In English, repetition can sound a little heavy, but in Spanish it is often perfectly natural, especially in formal or customer-service language.

Yes, combustible is normally a masculine noun:

• el combustible

Because it is masculine singular, anything that agrees with it must also be masculine singular:

• incluido, not incluida
• el, not la

So:

• el combustible está incluido

Because incluido agrees with combustible, which is masculine singular.

Agreement in Spanish works like this:

• masculine singular: incluido
• feminine singular: incluida
• masculine plural: incluidos
• feminine plural: incluidas

Compare:

• El combustible está incluido.
• La gasolina está incluida.

Here, the noun is combustible, so incluido is the correct form.

This is a very common learner question.

Está incluido describes a state or condition: the fuel is included as part of the service or price.

In Spanish, estar + past participle is often used to talk about the resulting state:

• está incluido = is included
• está cerrado = is closed
• está reservado = is reserved

Es incluido would usually sound unnatural here. It could suggest a passive construction in a context where Spanish strongly prefers estar.

So in service, booking, hotel, rental, and travel language, you will very often see:

• El desayuno está incluido.
• Los impuestos están incluidos.
• El seguro está incluido.

You can think of it mainly as describing the state of the fuel: it is included.

In practical learner terms, estar + participle often behaves very much like:

• a result
• a condition
• a status

So está incluido is best understood as:

• it is included
• it comes included

This is different from a more action-focused passive such as:

• El combustible fue incluido por la empresa. = The fuel was included by the company.

That version focuses more on the action. Your original sentence focuses on the current status.

Yes. That word order is also correct.

Compare:

• Según la política de combustible, el combustible está incluido.
• El combustible está incluido según la política de combustible.

Both mean basically the same thing. The difference is emphasis:

• Starting with Según la política de combustible highlights the source/basis first.
• Starting with El combustible está incluido highlights the main information first.

Both are natural, especially in formal or informational contexts.

Yes. It is especially common in:

• car rentals
• booking websites
• travel policies
• reservation details

It refers to the rules about fuel, such as:

• whether the tank must be returned full
• whether fuel is included
• whether there is a refill charge

So la política de combustible is a normal practical phrase in travel-related Spanish.

Yes, but the meaning becomes more specific.

• combustible = fuel in a general sense
• gasolina = gasoline / petrol specifically

In rental or policy language, combustible is often preferred because it is broader and more neutral. It can refer to whatever fuel the vehicle uses.

So:

• El combustible está incluido sounds more general and official.
• La gasolina está incluida is possible, but more specific.

Because that opening phrase is an introductory element.

Spanish often uses a comma after a fronted phrase like this, especially in formal writing:

• Según el contrato, ...
• En este caso, ...
• Por lo tanto, ...

The comma helps separate the introductory context from the main statement:

• Según la política de combustible, | el combustible está incluido.

In shorter informal writing, punctuation may vary a little, but with this kind of formal sentence, the comma is very normal.

It sounds neutral to formal.

It would fit well in:

• a website
• a booking page
• a rental agreement
• customer service information

It does not sound especially conversational. In everyday speech, a person might say something simpler, like:

• Sí, el combustible viene incluido.
• Sí, el combustible está incluido.

But the original sentence is perfectly natural for written informational Spanish.

Yes. Spanish has several natural ways to express the same idea.

For example:

• Incluye combustible. = It includes fuel.
• El combustible está incluido. = The fuel is included.
• La tarifa incluye combustible. = The rate includes fuel.

The version with está incluido is especially common when listing what is or is not included in a service.

So if you are reading travel or rental information, you will often see:

• Desayuno incluido
• Seguro incluido
• Combustible incluido