Difference In Fuel 91, 95 Benzene, Gasohol, E20?

[Paangjang]

Done a forum search and a google search but can't get a clear answer.

Whats the difference between E20 fuel, 91 benzene, gasohol and 95? Not looking for the make up of atoms and compounds or the periodic table, just like the difference between unleaded and super unleaded. Is one supposed to be cleaner or better than the other. Obviously there is a price difference so i guess this reflects the quality? My girlfriend's parents just bought us a new Mazda 3 sport. Mazda gave us a full tank of 91 for free with the car. Suggest to stay on that or change to one of the others? Much difference?

[katabeachbum]

so many existing topics on this here in Motoring, suggest scrolling back through the pages and read up

they are all unleaded

gasohol is commonly used about E10, petrol containing 10% ethanol

E20 contains 20% ethanol

E85 contains 85% ethanol

the number indicates Octane RON as in Europe

a new mazda 3 can use 91 and 95, E10 and E20, in general E20 can provide slightly lower milage than E10

[WarpSpeed]

And the more ethanol versus Benzine the less lubrication the top end gets (valve train) and there is a loss of performance in terms of power besides just mileage as well.

[Paangjang]

And the more ethanol versus Benzine the less lubrication the top end gets (valve train) and there is a loss of performance in terms of power besides just mileage as well.

Thanks Warpspeed. So..... "91" contains less ethanol than "95"? Making it provide more lubrication, power and mileage than "95" And "E20" even more so than "91"? Right? So in theory is Gasohol or Benzine better in terms of performance and mileage etc? Confused "E20" seems to be the best option but then why is it the cheapest? Or have i got this all back to front and top to bottom?

[WarpSpeed]

And the more ethanol versus Benzine the less lubrication the top end gets (valve train) and there is a loss of performance in terms of power besides just mileage as well.

Thanks Warpspeed. So..... "91" contains less ethanol than "95"? Making it provide more lubrication, power and mileage than "95" And "E20" even more so than "91"? Right? So in theory is Gasohol or Benzine better in terms of performance and mileage etc? Confused "E20" seems to be the best option but then why is it the cheapest? Or have i got this all back to front and top to bottom?

No, the other way around.. 91 and 95 "benzine" have no ethanol, they are merely "unleaded" so better top end lubrication as a rule then ethanol products. Any ethanol product therefore from 95 on down to E20 etc. contain ethanol of gradually higher percentages and provide less top end lubrication the higher the ethanol content.

An engine designed to withstand the lower lubrication levels (E20 for example) is ok though but it's really an unknown (at least to the general public) as to exactly how much additional wear and tear and shortened engine life in the end, is actually caused by it's use. No one is going to advertise the damage done and say it's no good as then the fuel companies can't sell it and the car companies get hammered for advertising it's benefits and the surrounding technology they're trying to promote.

Just to add, that the lead added used to be added for this purpose of top end lubrication, but now it's no longer added for decades.

[Paangjang]

And the more ethanol versus Benzine the less lubrication the top end gets (valve train) and there is a loss of performance in terms of power besides just mileage as well.

Thanks Warpspeed. So..... "91" contains less ethanol than "95"? Making it provide more lubrication, power and mileage than "95" And "E20" even more so than "91"? Right? So in theory is Gasohol or Benzine better in terms of performance and mileage etc? Confused "E20" seems to be the best option but then why is it the cheapest? Or have i got this all back to front and top to bottom?

No, the other way around.. 91 and 95 "benzine" have no ethanol, they are merely "unleaded" so better top end lubrication as a rule then ethanol products. Any ethanol product therefore from 95 on down to E20 etc. contain ethanol of gradually higher percentages and provide less top end lubrication the higher the ethanol content.

An engine designed to withstand the lower lubrication levels (E20 for example) is ok though but it's really an unknown (at least to the general public) as to exactly how much additional wear and tear and shortened engine life in the end, is actually caused by it's use. No one is going to advertise the damage done and say it's no good as then the fuel companies can't sell it and the car companies get hammered for advertising it's benefits and the surrounding technology they're trying to promote.

Just to add, that the lead added used to be added for this purpose of top end lubrication, but now it's no longer added for decades.

Got it. Thanks

[katabeachbum]

And the more ethanol versus Benzine the less lubrication the top end gets (valve train) and there is a loss of performance in terms of power besides just mileage as well.

Thanks Warpspeed. So..... "91" contains less ethanol than "95"? Making it provide more lubrication, power and mileage than "95" And "E20" even more so than "91"? Right? So in theory is Gasohol or Benzine better in terms of performance and mileage etc? Confused "E20" seems to be the best option but then why is it the cheapest? Or have i got this all back to front and top to bottom?

No, the other way around.. 91 and 95 "benzine" have no ethanol, they are merely "unleaded" so better top end lubrication as a rule then ethanol products. Any ethanol product therefore from 95 on down to E20 etc. contain ethanol of gradually higher percentages and provide less top end lubrication the higher the ethanol content.

An engine designed to withstand the lower lubrication levels (E20 for example) is ok though but it's really an unknown (at least to the general public) as to exactly how much additional wear and tear and shortened engine life in the end, is actually caused by it's use. No one is going to advertise the damage done and say it's no good as then the fuel companies can't sell it and the car companies get hammered for advertising it's benefits and the surrounding technology they're trying to promote.

Just to add, that the lead added used to be added for this purpose of top end lubrication, but now it's no longer added for decades.

Got it. Thanks

and to simplify, just picked up a new Mazda2 today, and will use

E10 gasohol 91 or 95 depending on price and availbility

occasional 91 petrol, not for the engine, but to lube the fuelsystem/injection

car can according to Mazda TH use E20, but slightly less power and milage, I see no point in long term testing E20 for mazda

[Gweiloman]

Does anyone have any thoughts about how best to mix usage of 91 benzine and 91 gasohol? For eg, for every three tanks of gasohol 91, fill one tank of benzine 91 to keep well lubricated? Also, what's better (in terms of fuel consumption) to use for city traffic as opposed to going long distances? I'm not so interested in top end performance as I don't believe in driving much beyond 120 kph on Thai roads anyway.

[katabeachbum]

Does anyone have any thoughts about how best to mix usage of 91 benzine and 91 gasohol? For eg, for every three tanks of gasohol 91, fill one tank of benzine 91 to keep well lubricated? Also, what's better (in terms of fuel consumption) to use for city traffic as opposed to going long distances? I'm not so interested in top end performance as I don't believe in driving much beyond 120 kph on Thai roads anyway.

my experience with a bunch of cars and bikes, no difference in consumption or performance from benzine to E10 gasohol same octane. Some perform better using 95 (E10) tho, I suspect 91 is not always 91 but perhaps 90-89.

3 tanks of E10 for every tank of benzine is what I have been doing since 2006.

Note, E fuels can/will separate during storage, so benzine for storage

On the other hand E fuels keep engine internals clean, and a shiny exhaust pipe

Looks like new after a 700km ride burning Ethanol for 6 hours

[Gweiloman]

Does anyone have any thoughts about how best to mix usage of 91 benzine and 91 gasohol? For eg, for every three tanks of gasohol 91, fill one tank of benzine 91 to keep well lubricated? Also, what's better (in terms of fuel consumption) to use for city traffic as opposed to going long distances? I'm not so interested in top end performance as I don't believe in driving much beyond 120 kph on Thai roads anyway.

my experience with a bunch of cars and bikes, no difference in consumption or performance from benzine to E10 gasohol same octane. Some perform better using 95 (E10) tho, I suspect 91 is not always 91 but perhaps 90-89.

3 tanks of E10 for every tank of benzine is what I have been doing since 2006.

Note, E fuels can/will separate during storage, so benzine for storage

On the other hand E fuels keep engine internals clean, and a shiny exhaust pipe

Looks like new after a 700km ride burning Ethanol for 6 hours

Thanks for the advise. Will try the 3:1 ratio and maybe monitor consumption at the same time.

I have almost exclusively been on E10 since I purchased my car 6 months ago but my exhaust looks like any others - not particularly shiny

[katabeachbum]

Does anyone have any thoughts about how best to mix usage of 91 benzine and 91 gasohol? For eg, for every three tanks of gasohol 91, fill one tank of benzine 91 to keep well lubricated? Also, what's better (in terms of fuel consumption) to use for city traffic as opposed to going long distances? I'm not so interested in top end performance as I don't believe in driving much beyond 120 kph on Thai roads anyway.

my experience with a bunch of cars and bikes, no difference in consumption or performance from benzine to E10 gasohol same octane. Some perform better using 95 (E10) tho, I suspect 91 is not always 91 but perhaps 90-89.

3 tanks of E10 for every tank of benzine is what I have been doing since 2006.

Note, E fuels can/will separate during storage, so benzine for storage

On the other hand E fuels keep engine internals clean, and a shiny exhaust pipe

Looks like new after a 700km ride burning Ethanol for 6 hours

Thanks for the advise. Will try the 3:1 ratio and maybe monitor consumption at the same time.

I have almost exclusively been on E10 since I purchased my car 6 months ago but my exhaust looks like any others - not particularly shiny

I used my 2006 Yaris once off Phuket when it was 2 years old, 700km to Hua Hin, tryed to keep my usual 160kmh cruisingspeed, which it sometimes managed, and ended up with a very shiny exhaust

felt like it had been tuned since, all the shit blown out from engine and exhaust it performed like, well a happy yaris

not going to do the same mistake with my mazda2, will blow her engine clean at least once a month, to make her perform properly when desired