[SuperchargedMR2]

Jeez how do you guys get past 30 mpg!?

I'm at 7.6L/100KM = 31 mpg = ~620 km is the best I can do before the computer estimator says I have like 5 km left with the empty light on.

Mixed driving and winter weather so heat is on.

Driving on the highway I am going 120 km/h and in the city 60-70 km/h..

Give me tips!!

You won't get great MPG doing 120 km/h or roughly 75 mph. The laws of physics catch up as speed increases. Above 50 mph MPG drops because wind resistance increases. The slower you cruise on the highway the better the MPG you will get, if you can keep it around 55-60 mph you should see decent averages.

 

[have2ride]

Most grades have the same additive packages from Top Tier gasolines and even if they don't the regular grade has many more times the level needed. Premium grade gasoline is for high performance on forced induction engines and is used to prevent pre-detonation. There have been many tests done that show it doesn't really help with MPG and even f it did a little bit the extra cost of the gas isn't worth it.

I agree on fuel economy, premium does not really improve mileage. But if premium is so useless, how come manufacturers usually test their cars 0 to 60 time using premium? And when they use regular, numbers are lower. When I had both Acura cars regular gas felt horrible, acceleration would get sluggish, motor would sound weird - somewhat quiet and vague, fuel consumption would go 30% below what I usually had. Now as far as iM goes, I can absolutely feel that my car accelerates better using premium, I don't need to downshift as much. Engine sounds cleaner and sportier. I am not just making this up. I really enjoy using premium and I am planning on using premium all the time.

 

[davect01]

I agree on fuel economy, premium does not really improve mileage. But if premium is so useless, how come manufacturers usually test their cars 0 to 60 time using premium? And when they use regular, numbers are lower. When I had both Acura cars regular gas felt horrible, acceleration would get sluggish, motor would sound weird - somewhat quiet and vague, fuel consumption would go 30% below what I usually had. Now as far as iM goes, I can absolutely feel that my car accelerates better using premium, I don't need to downshift as much. Engine sounds cleaner and sportier. I am not just making this up. I really enjoy using premium and I am planning on using premium all the time.

Your engine is designed to run on a particular octane

Please spend a bit of time and learn what octane ratings mean and why you really don't gain anything by buying different grades. I really wish they had not used the terms they do. Premium does not mean superior, it simply means it matches different engines better.

https://coverhound.com/insurance-learning-center/is-high-octane-gas-better-for-your-car

https://www.scientificamerican.com/article/fact-or-fiction-premium-g/

 

[SuperchargedMR2]

I agree on fuel economy, premium does not really improve mileage. But if premium is so useless, how come manufacturers usually test their cars 0 to 60 time using premium? And when they use regular, numbers are lower. When I had both Acura cars regular gas felt horrible, acceleration would get sluggish, motor would sound weird - somewhat quiet and vague, fuel consumption would go 30% below what I usually had. Now as far as iM goes, I can absolutely feel that my car accelerates better using premium, I don't need to downshift as much. Engine sounds cleaner and sportier. I am not just making this up. I really enjoy using premium and I am planning on using premium all the time.

If you experienced 30% lower mileage then there was something else wrong with your car and the added octane was most likely helping to prevent pinging and pre-detonation. Premium fuel is designed to be used with engines that are tuned for it. Manufacturers test the cars with the fuel grade that is recommended. Many cars use premium because they either have high performance NA engines or boosted engines as in turbocharged and supercharged. For the first 94k miles on my 09 Corolla S I used regular grade and it ran perfectly fine. After I turbocharged it I now use premium because the tune was done on premium gas so that it protects the engine from any pre-detonation damage.

What you are experiencing with your iM is what you want to believe that you hear and feel. There are hundreds of scientific comparisons proving that it doesn't make any difference on cars that are designed to use regular 87 octane. I'm not sure about the Acura but maybe it required premium fuel? Many high performance NA motors do. If you ran regular in it when it needed premium it would behave like you said.

On my 89 Supercharged MR2 there is actually a switch that allows be to use regular or premium. When I use regular the timing is retarded and power is reduced to protect the engine. It doesn't sound any different and in regular driving I don't notice much different. I tend to drive it for fun though and have it in the mountains so I use premium to get that extra boost and power from the timing being more advanced.

And watch the video links that were listed!

 

[RAITHSKAR]

My 5-spd manual 2015 Yaris SE is rated at 30 city / 37 highway, but I have been averaging 41.4 MPG over the last 2.5+ years of ownership thus far (all suburb/city commuting, no long road trips) - on regular Shell 87 octane fuel (which my car is tuned for). I did try Shell Premium for a month about a year ago, and there was no difference in MPG or 'feel' of the car. I just paid more at the pump each week.

 

[davect01]

My 5-spd manual 2015 Yaris SE is rated at 30 city / 37 highway, but I have been averaging 41.4 MPG over the last 2.5+ years of ownership thus far (all suburb/city commuting, no long road trips) - on regular Shell 87 octane fuel (which my car is tuned for). I did try Shell Premium for a month about a year ago, and there was no difference in MPG or 'feel' of the car. I just paid more at the pump each week.

You will see a performance improvement with more expensive gas. Your wallet is lighter and thus your car weighs less.

Other than that nothing.

 

[SuperchargedMR2]

My 5-spd manual 2015 Yaris SE is rated at 30 city / 37 highway, but I have been averaging 41.4 MPG over the last 2.5+ years of ownership thus far (all suburb/city commuting, no long road trips) - on regular Shell 87 octane fuel (which my car is tuned for). I did try Shell Premium for a month about a year ago, and there was no difference in MPG or 'feel' of the car. I just paid more at the pump each week.

My 2009 Corolla S 5-speed MT was rated at 27/35 city/hwy when it came out. Over the first 94k miles I averaged 36.2 mpg combined which is a lot higher then the 30 combined rating. Your driving habits make the biggest difference in mpg.

 

[davect01]

My 2009 Corolla S 5-speed MT was rated at 27/35 city/hwy when it came out. Over the first 94k miles I averaged 36.2 mpg combined which is a lot higher then the 30 combined rating. Your driving habits make the biggest difference in mpg.

Totally. When I drive more aggressive it really does make a difference.

 

[SuperchargedMR2]

Totally. When I drive more aggressive it really does make a difference.

It may be more fun but it does take a hit on the MPG.

 

[davect01]

It may be more fun but it does take a hit on the MPG.

Totally.