Paul_JJ Posted July 30, 2016 Share Posted July 30, 2016 They calculated it differently, the cheapest was probably 92 RON. And their 93 is our 97 or similar. But the point taken the petrol out there is not great! This guy explains really well what Octane rating is: http://www.youtube.com/watch?v=cfhTTuxF6Mk US and Europe calculate it in different ways which makes US fuel look like it has a lower rating but in reality they've got the same rating. US shows the average of the Research Octane Number (RON) and Motor Octane Number (MON) rating, which is the Anti-Knock Index (AKI) while Europe just shows the RON rating which gives a higher number than the MON rating. More info from wiki: The most common type of octane rating worldwide is the Research Octane Number (RON). RON is determined by running the fuel in a test engine with a variable compression ratio under controlled conditions, and comparing the results with those for mixtures of iso-octane and n-heptane (a fuel standard). Motor Octane Number (MON), which is a better measure of how the fuel behaves when under load, as it is determined at 900 rpm engine speed, instead of the 600 rpm for RON.[1] MON testing uses a similar test engine to that used in RON testing, but with a preheated fuel mixture, higher engine speed, and variable ignition timing to further stress the fuel's knock resistance. Depending on the composition of the fuel, the MON of a modern gasoline will be about 8 to 10 points lower than the RON, however there is no direct link between RON and MON. Normally, fuel specifications require both a minimum RON and a minimum MON. Basically MON uses a higher stress test and because of that it gives a lower Octane number as the fuel is under greater stress than when it is being tested through RON method. tl;dr:UK and rest of Europe show the RON rating. US/Canada show the AKI rating which is the average of RON and MON rating. 1 Quote Link to comment Share on other sites More sharing options...
Sandals Posted July 30, 2016 Author Share Posted July 30, 2016 Interesting, didn't know that. I just assumed like other things the US make, would be of inferior quality XD 1 Quote Link to comment Share on other sites More sharing options...
dgarside Posted August 5, 2016 Share Posted August 5, 2016 So taking this a little with a pinch of salt as it was just over 8 miles.... :-)..... But beat that :-) :-) :-) Who needs a diesel oil burner when you have an STI :-) Sent from my iphone using Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
Sandals Posted August 6, 2016 Author Share Posted August 6, 2016 9 hours ago, dgarside said: So taking this a little with a pinch of salt as it was just over 8 miles.... :-)..... But beat that :-) :-) :-) Who needs a diesel oil burner when you have an STI :-) Sent from my iPhone using Tapatalk 8 miles of downhill driving? :D Quote Link to comment Share on other sites More sharing options...
dgarside Posted August 6, 2016 Share Posted August 6, 2016 Tesco Petrol Station at Prestwich via M62 to Trafford Centre at peak commute time yesterday [emoji39] Sent from my iPad using Tapatalk Quote Link to comment Share on other sites More sharing options...
david1972 Posted August 6, 2016 Share Posted August 6, 2016 28.4 from my latest tank; generally pottering around and some spirited enjoyment. Have to say I'm well impressed that it is consistently better than my outback was [emoji2] Sent from my iphone using Tapatalk Quote Link to comment Share on other sites More sharing options...
stants Posted August 6, 2016 Share Posted August 6, 2016 Just to make you feel better sandals &dave after my magical 40mpg I managed to get about 85 miles for the last 30quids worth I put in 😂 Sent from my SM-G930F using Tapatalk Quote Link to comment Share on other sites More sharing options...
david1972 Posted August 6, 2016 Share Posted August 6, 2016 Just to make you feel better sandals &dave after my magical 40mpg I managed to get about 85 miles for the last 30quids worth I put in [emoji23] Sent from my SM-G930F using Tapatalk Haha pedal to the metal [emoji6][emoji592][emoji100][emoji100][emoji100] Sent from my iphone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Sandals Posted August 6, 2016 Author Share Posted August 6, 2016 2 hours ago, stants said: Just to make you feel better sandals &dave after my magical 40mpg I managed to get about 85 miles for the last 30quids worth I put in 😂 Sent from my SM-G930F using Tapatalk It's all a balancing act... drive sensibly when it's busy, drive like you stole it when you feel like it... swings and roundabouts!! 2 Quote Link to comment Share on other sites More sharing options...
stants Posted August 6, 2016 Share Posted August 6, 2016 Wouldn't have minded but never really got over 40mph last week that was just commuting in traffic etc Sent from my SM-G930F using Tapatalk Quote Link to comment Share on other sites More sharing options...
Sandals Posted August 7, 2016 Author Share Posted August 7, 2016 7 hours ago, stants said: Wouldn't have minded but never really got over 40mph last week that was just commuting in traffic etc Sent from my SM-G930F using Tapatalk Yeh I get that as well when travelling into Edinburgh for my night shifts, which is mainly why i generally get over 300 miles to a tank Quote Link to comment Share on other sites More sharing options...
Paul_JJ Posted August 14, 2016 Share Posted August 14, 2016 I think if you really want an economical car, you need to buy a diesel -) but I hate diesels... My MPG has improved after a replaced a Knock Sensor - there was no error code though. 1 Quote Link to comment Share on other sites More sharing options...
dgarside Posted August 20, 2016 Share Posted August 20, 2016 Yeah, MPG discussions on WRX/STI are all very tongue in cheek for me. But I guess it's good to know and a good challenge [emoji12] Sent from my iPad using Tapatalk Quote Link to comment Share on other sites More sharing options...
Sandals Posted August 20, 2016 Author Share Posted August 20, 2016 I'm getting 50mpg!!! In my wife's Yaris....... Quote Link to comment Share on other sites More sharing options...
Gambit Posted August 20, 2016 Share Posted August 20, 2016 I just close my eyes now and hope for the best 1 Quote Link to comment Share on other sites More sharing options...
david1972 Posted August 20, 2016 Share Posted August 20, 2016 Mine seems to like Tesco momentum best for mpg...both tanks when I've had to fill with that so far have returned better figures than the Shell ones, with similar types of driving Sent from my iphone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Sandals Posted August 21, 2016 Author Share Posted August 21, 2016 It will be interesting to see what difference i get when i get my car remapped :D Quote Link to comment Share on other sites More sharing options...
dgarside Posted August 22, 2016 Share Posted August 22, 2016 Same here, still considering getting it done before warranty expires.... Mmmmm Sent from my iphone using Tapatalk Quote Link to comment Share on other sites More sharing options...
david1972 Posted September 3, 2016 Share Posted September 3, 2016 last tank over 30mpg again Quote Link to comment Share on other sites More sharing options...
Sandals Posted September 3, 2016 Author Share Posted September 3, 2016 I think i'm losing a few mpg's due to a busted o2 sensor... Quote Link to comment Share on other sites More sharing options...
Beano_wrx Posted September 12, 2016 Share Posted September 12, 2016 God knows what I do with my jdm wrx at 505bhp. But I dnt look at mpg. I c low fuel and just fill up. Nopoint owning a performance car if watching the mpg 1 Quote Link to comment Share on other sites More sharing options...
Sandals Posted September 12, 2016 Author Share Posted September 12, 2016 4 hours ago, Beano_wrx said: God knows what I do with my jdm wrx at 505bhp. But I dnt look at mpg. I c low fuel and just fill up. Nopoint owning a performance car if watching the mpg It's nice to know that you can have performance when you need it but also get decent mileage... especially if it's a daily driver! 2 Quote Link to comment Share on other sites More sharing options...
Sandals Posted September 26, 2016 Author Share Posted September 26, 2016 Right, filled it up with Momentum 99 (which my car seems to like now since I changed the spark plugs!) and about to commence a week of night shifts... which means sensible motorway driving and some short town driving. This is the first full fill up since getting the remap so will be interesting to see what difference it has made! Quote Link to comment Share on other sites More sharing options...
david1972 Posted September 26, 2016 Share Posted September 26, 2016 My last tank was my best yet...33.0mpg...mostly a trip to Huddersfield and back Sent from my iphone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Sandals Posted September 26, 2016 Author Share Posted September 26, 2016 8 minutes ago, david1972 said: My last tank was my best yet...33.0mpg...mostly a trip to Huddersfield and back Sent from my iPhone using Tapatalk Good stuff! I'm looking forward to seeing how i get on, it was down to half a tank and I had covered 180 miles... it was mapped on this tank as well and I've been using boost a lot since the novelty hasn't worn off yet :D Quote Link to comment Share on other sites More sharing options...
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