How aggressive is your aggressive? Deng can still return 15km/L

How aggressive?

Drive down the highway above 110..like 130-140.
Then once in a while floor the accelerator in 3rd just to accelerate quicker (car not underpower , more like addicted to VVTi powahh) .

Now FC better liao. Changed to 0w20. Can get 17Km/L city driving.
Trying to follow "Eco" light as much as possible though kinda tough..
Less of speeding beyond 100 on highway.

Still quite far. Anyway with big power comes big drinking! 😅

I don't know.

I think it's best you get advise from Mazda Service Centre foreman or ask sifus in LYN Mazda's threads.

I keep seeing ppl who drive saga blm mt get over 13~16km/L. How do you guys achieve that? I drive so lightfoot the most i can get is 9.75km/L I upshift when I am 2k rpm and my speed is always at 80kmh still cannot pump the number over 10 sia

40% city 60% highway

Then something is seriously wrong with your engine. Like worn out or something. 10Km/l on a 1.3L engine (yeah I know its Campro) is out of spec.

Another thing is - For best FC, go for 10w30 oil, If you willing to try - 0w20.
Also fuel brand does affect (some) FC. Need to check what BLM users uses that gives the best FC.

I doubt saga can get 13 to 16km/L. its a farking old tenchnology. if u not believe, go see fuelly website. Its average is like 11km/L. Clearly someone tokok.

btw, u cant really compare exactly the fc. Yes, both of u might drive 100% at city. but one person need to face 10 traffic light, while another person need to face 0 traffic light. yes, both are 100% city drive, and due to this both cars fc will be different.

u already drive very economical. keep it up. nothing u can do anymore. road condition might not on ur side.

This post has been edited by DS51: Nov 1 2020, 09:08 AM

slow n steady... fast upshift at low rev... is wrong method

you are spending lots of time at lowish gears... and engine running at suboptimal conditions... both will cause bad mileage

you want to get to cruising speed asap... so if car 0-100 is 13s, try to do it in say 18-26s...but don't over-rev or red line. small cc engines are designed for higher rev. my 1.5 swift I rev to 3k for gear shifts...

It was worst when I am using shell petrol, around 8~8.5km/l
I actually bought this car as second hand to have a ride to go university so I have no idea when was the last maintainance made by last owner except engine oil and filter.

Do changing iridium spark plug makes fc better?(milleage now 106k,bought when at 83k) I been planning to change my o2 sensor and spark plug for a long time but i am afraid they are just a waste of money

Ya it is really hard to believe they can get 13 to 16km/L, I even tried to cruise my car at 2k rpm at highway yet they are still the same.

we do get ppl here use eco tire pump to 45 psi...lol

not just maintenance... sometimes is also equipment manufacturing tolerances usually ±5-10%, can cause quite a bit of difference... if my car is at +10%...your car at -10%... it's now 20% difference between our cars...

case in point... my bff and I bought same batch wira, stay same area, work same office... my mileage was much better than him, we could not understand why... he send his car to few places for checking all came out no problem...

no need iridium unless you wanna keep car for long time...but new plugs do help. no need o2 sensor unless you know got problem... ie can smell petrol after driving a while, or exhaust pipe not clean, etc. simple way to test for good combustion is raining and cold morning, see if exhaust got lots of water vapor coming out...if no vapor most likely too rich

This post has been edited by dwRK: Nov 1 2020, 10:00 AM

I read the sweet spot for most engine is between 2k to 3k rpm. And I always shift gear in that zone. btw, on city really hard to measure fc, sometimes the main culprit is road and traffic which we cannot control.

Frequent brakes and accelerate: fuel wasting.

People can talk without facts nia. If really can get 16km/L, try asking them how many km they travel with full tank of petrol..sometimes they plug the info from sky nia..

13 to 16km/L is like honda city fuel territory and the engine is 10 years newer. I know, I use saga b4. But no point argue with them. Ownself drive also know, the figure to good to be true.

the sweet spot is actually within the power band...between peak torque and peak power....say 4k to 7k... but we don't usually try to do century run ah from every traffic lights... hahaha

so the comfortable gear change ends up just before or around the peak torque rpm... old engine around 4-5k, modern around 3-4k... except rotary around 7-9k...

I enjoy driving...so I don't worry about fc... but since I know the "secret to good fc" , my fast launching and higher speed don't sap my fc too much... hahaha

I try shift above 3k rpm b4 for my car, the fc shot high up.lol. really depends on car maybe.

btw, I had experience various rpm shift. and Its quiet tiring process. btw, still for my car, its between 2k to 3k rpm.

ah my numbers refer to rpms before the peak torque curves.... modern engines they designed for good low end torque and the curve is very flat... easy driving 1.8-2.5k wanna start changing gears liao... no issue lah

the higher rpm shifts are to get to cruising speed asap... idea being extra fuel burn in the short launch is offset by low fc during the longer drive... so must depends on situation

yeah... all the ideal rpm shifts are car specifics

Shift as early as possible without lugging ur engine..I dont really agree with max efficiency achieve at 3k to 4k rpm. Had u test shift at 2500rpm and it return worse fuel economy than 3-4k rpm?. If u said, just a bit more only, then it is acceptable. If u said, 2500rpm is suck more than 3-4k then I respect ur car.

Its same like argument here b4 where someone said 110kmh is the optimal efficiency of his cars, while majority cars out there optimal efficiency is at 80kmh to 90kmh.

Btw, have a look, demonstration show best fuel efficiency is achieve when changing gear at 1500rpm to 3000rpm



This post has been edited by DM52: Nov 1 2020, 07:28 PM

I don't really focus at rpm tbh...I just listen to the car, when it shifts down it isn't struggling

what I can tell is this, if I drive gentle follow crowd my fc is bad...if drive more aggressive my fc is good... example car1, 6.5 vs 6.1, car2, 4.8 vs 4.5... l/100km

each car has different/ideal rpm band...also % savings different... there's no perfect rpm or perfect speed... it all depends on knowing the car... when I get a new car, I always look for the engine curve to give more insights on how best to drive it....

edit: after watching video... he/i not doing/saying anything different... let me explain a bit more... engine works well with about 80% loading, my higher rpm faster gear shift is to give the engine this load, if you shift up too fast, the loading is excessive engine will struggle and use more fuel, if you stay in gear too long, the loading diminishes and you use more fuel, similarly if you over rev, the the loading diminishes as well, and use more fuel, it is this balance to give constant loading to get up to cruising speed where you will find the best fc

This post has been edited by dwRK: Nov 1 2020, 09:21 PM

for my car persona vvt, the sweet spot is truly 2.9k-3k rpm to upshift if you are still planning to accelerate gently.
Basically, the car needs 2k at least to do decent acceleration. Upshifting from 2.5krpm will make the next gear start at around 1.8k rpm, which will bog down the car's acceleration.
It will struggle for a while, before picking up again (after 2k rpm).
This is especially apparently for 5th gear. If I'm in 5th gear below 2krpm, will gently decelerate. Need to press accelerator around 40% in order to maintain speed. Which is rather fuel consuming.
So during 4th -> 5th gear, i may even pull up to 3.2k rpm so that i can enter 5th gear in 2.2k rpm, where i just need to feather 15-20% to the gas pedal to maintain speed.

When I first gotten this car, i tried to upshift as soon as possible.. keeping the car RPM around 1.5k-2.5k rpm. but i ended up getting a worse FC and very poor experience, as the car feels sluggish at all times. Then sometimes as I was rushing, i held on the gear for longer periods, and during that week, i actually gotten better FC. that's when I realized, it's better to accelerate asap to your desired speed, than to slowly crawl to your desired speed at higher gears.
another thing that aids fuel consumption, is downshifting to lower gears during hill descend. Higher RPM, but engine braking actually keeps FC low.
Tried descending with 4th gear (2krpm) vs 3rd gear (3k rpm). Generally get better results with 3k rpm. 2nd gear (4.2k rpm) too noisy. didn't bother/like doing that during descend (unless i'm already in the 2nd gear at the moment)

p/s: i've read back and noticed ppl was discussing over saga blm mt. Well my wife is driving saga blm mt, and i can only say, the car characteristic is very different from my persona vvt mt. Her car can easily move within 1.5k-2.5k rpm. When driving her blm, i never needed to rev till 3k. Tend to upshift a lot earlier. Persona VVT needs at least 15kmh to move smoothly in gear 2 (without needing to hold onto the clutch that long), as opposed to her BLM, which can easily slot in 2nd gear at 5kmh and move smoothly with clutch fully engaged.

This post has been edited by tctham: Nov 2 2020, 11:07 AM