13-06-2014, 11:10 PM
Eeek!
Higher Octane =/= Greater efficiency!
Higher Octane can be used in engines with higher compression ratios to yield greater efficiency, however we're not changing the CR here. Any increase in MPG is simply from the additives in the fuel, not the octane...
Octane is simply a measurement of how easily the fuel will ignite with compression/heat... Higher the octane, more resistance there is to it detonating, meaning higher CRs and higher temperatures
for lairy high compression petrols and heavilly turbocharged engines.
GTi6s really don't need it - I've seen my GTi6 on 95RON on diagnostics on a hot UK day and never seen any evidence of a timing pull by that reckoning 99% of the time, you're going to notice no benefit from the Octane ... Literally, I seriously doubt you could get the ECU to pull timing unless the fuel is REALLY bad or it's a SERIOUSLY hot day and your intake is sucking from infront of the radiator.
If the additives in the fuel are working well, however - fair enough! I've seen additives do good things... But saying switching to 97/98/99 Octane will ensure that you hold both tyres fully lit at the top of 3rd... I think not..
Higher Octane =/= Greater efficiency!
Higher Octane can be used in engines with higher compression ratios to yield greater efficiency, however we're not changing the CR here. Any increase in MPG is simply from the additives in the fuel, not the octane...
Octane is simply a measurement of how easily the fuel will ignite with compression/heat... Higher the octane, more resistance there is to it detonating, meaning higher CRs and higher temperatures
for lairy high compression petrols and heavilly turbocharged engines.GTi6s really don't need it - I've seen my GTi6 on 95RON on diagnostics on a hot UK day and never seen any evidence of a timing pull by that reckoning 99% of the time, you're going to notice no benefit from the Octane ... Literally, I seriously doubt you could get the ECU to pull timing unless the fuel is REALLY bad or it's a SERIOUSLY hot day and your intake is sucking from infront of the radiator.
If the additives in the fuel are working well, however - fair enough! I've seen additives do good things... But saying switching to 97/98/99 Octane will ensure that you hold both tyres fully lit at the top of 3rd... I think not..
