I bought a Toyota Vios 2010 six month ago. I have been using Gasohol 91 ever since. The problem I am facing is, that Gasohol 91 is not available at lots of service stations. Gasohol 95 seems to be a lot more available. Is it all right to alternate between 91 and 95 or to switch to Gasohol 95 altogether without doing any damage to the engine?

It's perfectly OK to use 91 or 95, or any mix of the two in an engine that specifies 91 octane fuel - which your is.

The only instance where 91 should not be mixed with 95 is for engines that specify 95 octane fuel (e.g. some Euros and performance cars)

Has the Vios 2010 engine changed I thought they use the same engine as the Yaris and I was told only to use Gasohol if there is no 91 red petrol available the inside the petrol cap is a 91 red sticker but it still reads on it you can use 91 gasohol.

I thought we had been all through this Gasohol thing before.

There's no reason to use regular benzene in cars that are designed to run gasohol. There used to be back when the prices were much closer, as gasohol delivers slightly less km/l than benzene, but now that benzene is 6-10 Baht/Liter more expensive than the same RON rated gasohol, that's all changed.

BKK fuels prices here: http://www.eppo.go.t...ail_prices.html

It's perfectly OK to use 91 or 95, or any mix of the two in an engine that specifies 91 octane fuel - which your is.

The only instance where 91 should not be mixed with 95 is for engines that specify 95 octane fuel (e.g. some Euros and performance cars)

Thanks a lot for your reply about having not to worry about switching from Gasohol 91 to 95 or mixing the two of them.

There's no reason to use regular benzene in cars that are designed to run gasohol. There used to be back when the prices were much closer, as gasohol delivers slightly less km/l than benzene, but now that benzene is 6-10 Baht/Liter more expensive than the same RON rated gasohol, that's all changed.

BKK fuels prices here: http://www.eppo.go.t...ail_prices.html

I'm confused is that a yes or a no then for a 2008 Yaris in earlier threads Gasohol was getting trashed about rotting rubber components and shortening engine life.

There's no reason to use regular benzene in cars that are designed to run gasohol. There used to be back when the prices were much closer, as gasohol delivers slightly less km/l than benzene, but now that benzene is 6-10 Baht/Liter more expensive than the same RON rated gasohol, that's all changed.

BKK fuels prices here: http://www.eppo.go.t...ail_prices.html

I'm confused is that a yes or a no then for a 2008 Yaris in earlier threads Gasohol was getting trashed about rotting rubber components and shortening engine life.

I would be careful with E20. Gasohol E10 can be used without damages to a 2008, and can be blended with all pure petrol and gasohol E10, 91 and 95.

There's no reason to use regular benzene in cars that are designed to run gasohol. There used to be back when the prices were much closer, as gasohol delivers slightly less km/l than benzene, but now that benzene is 6-10 Baht/Liter more expensive than the same RON rated gasohol, that's all changed.

BKK fuels prices here: http://www.eppo.go.t...ail_prices.html

I'm confused is that a yes or a no then for a 2008 Yaris in earlier threads Gasohol was getting trashed about rotting rubber components and shortening engine life.

I would be careful with E20. Gasohol E10 can be used without damages to a 2008, and can be blended with all pure petrol and gasohol E10, 91 and 95.

Thanks Kbb.

i'm using gasohol 95 but now i want to use gasohol 91 it's almost 3 baht cheaper per liter...

can i switch to gasohol 91? what's the difference anyway except the pricing?

my engine is 4g63 mitsubishi engine.

i'm using gasohol 95 but now i want to use gasohol 91 it's almost 3 baht cheaper per liter...

can i switch to gasohol 91? what's the difference anyway except the pricing?

my engine is 4g63 mitsubishi engine.

4G63 pre-dates ethanol blended fuel (i.e. gasohol), so earlier models likely don't have a fuel system designed to withstand alcohol mixes - that means that any form a gasohol is likely to be an unhealthy choice for your engine if its > 4-5 years old. However, if it's an engine swap things may be different - depends on what fuel system parts were used when the transplant took place if that's the case.

In any case, assuming your fuel system is designed to withstand Ethanol blended fuel (or you don't care), whether or not you need 91 or 95 RON depends on the engine type and tune. Non-turbo variants of the 4G63 will be fine running on 91 RON, but the turbo version will surely want 95 RON.

i'm using gasohol 95 but now i want to use gasohol 91 it's almost 3 baht cheaper per liter...

can i switch to gasohol 91? what's the difference anyway except the pricing?

my engine is 4g63 mitsubishi engine.

4G63 pre-dates ethanol blended fuel (i.e. gasohol), so earlier models likely don't have a fuel system designed to withstand alcohol mixes - that means that any form a gasohol is likely to be an unhealthy choice for your engine if its > 4-5 years old. However, if it's an engine swap things may be different - depends on what fuel system parts were used when the transplant took place if that's the case.

In any case, assuming your fuel system is designed to withstand Ethanol blended fuel (or you don't care), whether or not you need 91 or 95 RON depends on the engine type and tune. Non-turbo variants of the 4G63 will be fine running on 91 RON, but the turbo version will surely want 95 RON.

its not only the engine

rubber gaskets/hoses on fuel cap, fuel tank, fuel pump

1st test is to leave fuel cap in E20 for a couple of days. I f rubber dissolves, expect the rest of car not to like gasohol

i think it is ok to switch to gasohol 95 from 91, and even from 91 to 95, i don't know, i take both for my car.

i think it is ok to switch to gasohol 95 from 91, and even from 91 to 95, i don't know, i take both for my car.

Thanks for the reassurance.