Iran Fuel quality

[RgrWynne]

1 hour ago, Britprius said:

It is a misconception that higher rated fuel means more mpg. It is the number of calories in fuel that decides it's energy content.
The so called lower grades of fuel contain more calories, and as such used in an engine designed for that fuel will give the best mpg. Diesel is a lower grade of fuel than petrol, but gives better mpg. Higher rated fuels will only give there best when used in engines designed to use them.
You get no benefit from using a high rated fuel in an engine not specifically designed for it.

John

I run my LS 430 and my wife’s Honda 2.0 Petrol engine  on BP Ultimate and sometimes Shell  V Power and absolutely get not only better fuel consumption, but noticeable running smoothness in both vehicles. I also have a colleague who did an actual trial over 5000 miles with his own vehicle and kept meticulous records. There was a definite and noticeable improvement in fuel economy. Was it worth the extra cost ? His view was ..... it depends on the differential fuel cost. This was not a theoretical trial. For me it is incidental that the above fuel is higher octane, but more the additives in the fuel, which I personally prefer to use.

Roger

[LS road runner]

On 8/26/2018 at 7:49 PM, RgrWynne said:

I run my LS 430 and my wife’s Honda 2.0 Petrol engine  on BP Ultimate and sometimes Shell  V Power and absolutely get not only better fuel consumption, but noticeable running smoothness in both vehicles. I also have a colleague who did an actual trial over 5000 miles with his own vehicle and kept meticulous records. There was a definite and noticeable improvement in fuel economy. Was it worth the extra cost ? His view was ..... it depends on the differential fuel cost. This was not a theoretical trial. For me it is incidental that the above fuel is higher octane, but more the additives in the fuel, which I personally prefer to use.

Roger

Please see below, 341 miles covered in just under half a tank, 38.5mpg on fuel which was costing 10p per litre, the car was down on power too as fuel quality was very poor. Due to sanctions on Iran they don't even have a proper refinery. There is still a pickup truck from 1970 which you can still buy new today (Nissan Zamyad) as they are not getting any new tech the line for this truck is still running. 

 

PS- Pic was taken by the passenger before someone decides to become internet police and comment on why I was using my phone whilst driving.