Super or regular unleaded?
#1
Super or regular unleaded?
I have been following this thread:
https://www.fitfreak.net/forums/eco-...vice-here.html
But really wonder if anyone has a definate answer, with testing results on which type of fuel give the most mpg?
handymus
https://www.fitfreak.net/forums/eco-...vice-here.html
But really wonder if anyone has a definate answer, with testing results on which type of fuel give the most mpg?
handymus
#2
Nothing definitive. But there's a good amount of evidence supporting the theory that the ECU runs more ignition advance on the higher octane fuels. Whether or not that translates into more power, or more net efficiency remains to be determined.
So while premium fuel may garner better mpg, my opinion is that there's not much chance of that improvement outweighing the initial cost of the fuel.
That said, I buy premium now - a couple dollars a month isn't a big deal.
So while premium fuel may garner better mpg, my opinion is that there's not much chance of that improvement outweighing the initial cost of the fuel.
That said, I buy premium now - a couple dollars a month isn't a big deal.
#5
#6
Looks like our Fits can't really take advantage of the premium like a higher compression car could.
handymus
#7
No problem. Glad to help people save some money at the gas station. However, I still fill up with supreme at Chevron once a month. The rest of the time it's all Chevron regular.
#8
But again, ignition advance equaling more power on this car has yet to be demonstrated.
#11
Unless I missed something, your datalogs were with the first generation Fit. Your recent post sums things up:
I've seen nothing to indicate that running premium fuel in an engine designed for regular does much more than empty your wallet faster. If I had a blown Fit, premium gas would be an entirely different matter.
Nothing definitive. But there's a good amount of evidence supporting the theory that the ECU runs more ignition advance on the higher octane fuels. Whether or not that translates into more power, or more net efficiency remains to be determined.
So while premium fuel may garner better mpg, my opinion is that there's not much chance of that improvement outweighing the initial cost of the fuel.
So while premium fuel may garner better mpg, my opinion is that there's not much chance of that improvement outweighing the initial cost of the fuel.
#12
I thought I was getting about 3 more MPG when I used premium compared to regular but I'm not. The last fill up I put in premium and only got about 1 more MPG. For me, the extra $$$ spent isn't worth it.
#13
I've seen nothing to indicate that running premium fuel in an engine designed for regular does much more than empty your wallet faster.
And even without knowing whether that advanced ignition timing translates into more power or mpg, I'm saying that an extra 3 dollars a fillup is a financial risk I'm willing to take.
#14
That's cool that you got more mpg with premium. I actually lose anywhere from 2-5 mpg with premium. I think it has to do with my granny style driving. I've heard that those who drive like me will see loss in FE with premium, and those who drive their cars hard will see an increase.
#15
The Fit does not run timing advance with premium fuel. It doesn't have a fancy pantsy fuel type detector. It would only pull timing if it senses knock, like most cars. Since this is the case, premium fuel would only decrease MPGs since it has less energy than regular. Premium is more stable, good for high comp and forced induction. It's more expensive because it has more additives to be more stable and remove deposits.
#17
Yeah, seriously. I own a device which shows me timing advance--it's a ScanGauge II--and it indicated the ECU was putting more advance with premium. I logged my best tank this year running premium. I also ran some average mileage with premium. I don't seem to save much running 93 octane, but I can tell the difference in torque, so I'm using 93.
#18
i clapped my hands 3 times before i got in my car every day last week, and i got the highest mpg on that tank than ever before. so now i'm going to clap 3 times before every drive to get better mpg. sike.
you will need a lot more statistics involving temperature, drive distances, road conditions, traffic, and like one hundred other variables before you can even start to make a credible claim that running a higher octane got you a higher mpg. if you had someone fill up your tank without telling you what octane they used, i am very skeptical that you can feel the torque upon acceleration and tell them if they used premium or regular.
you will need a lot more statistics involving temperature, drive distances, road conditions, traffic, and like one hundred other variables before you can even start to make a credible claim that running a higher octane got you a higher mpg. if you had someone fill up your tank without telling you what octane they used, i am very skeptical that you can feel the torque upon acceleration and tell them if they used premium or regular.
#20
touche haha. most of it wasn't directed at you really, but your post just initiated me to make a post explicitly stating some things. simply because i see people posting claims all the time and i think some people read the posts and are gullible enough to believe anything. you're right, you didn't really claim some of the things i was pointing out, but i just thought it implied some things that i wanted to give my thoughts on.
Last edited by doctordoom; 08-26-2009 at 02:10 AM.