Thats where some of the newer cars like in Honda, and Toyota (and Perodua) have Eco lights to tell the driver how economical is their right foot.
No need guess where is the sweet spot, the ECU calculates and tells the driver.
Regardless manual or auto.

On most cars they have Instant FC meters for the driver to gently press as light as possible.
Though it needs more eyes and "concentration" on the meter to get the "lowest" FC reading possible.

Looking at RPm doesnt work. Trust me.
My basic Axia E doesnt even have a tach. Only ECO light and engine sound to judge.

Fast launch and higher speed dont sap my fc much

Tbh, fuel consumption not much difference between speed. Lets say someone cruise 80kmh with someone cruise 100kmh.

The main culprit is acceleration. that is why cannot launch fast fast. Yeah, I met a lot people like u, fast launch then long driver hope the fc will be efficient. its not.

if u got fc reading on dashboard, u try drive
1) 2k rpm, then cruise 100kmh
2) 4krpm, then cruise 80kmh.

I had try above method and Option 1 is more fuel efficient. But option 1 cannot be follow by someone who easily butthurt at traffic light and want to win drag race like what 90% malaysian driver are.

I dunno why, the option 2 just dont work. Maybe too much fuel burning during that short period of times.


No need to glance so frequently la bro..sometimes also can..the most important is rights leg is consistent.

U cant have a cake and eat its too..at traffic light, even bmw 330i will lose to honda city if city do full throttle and 330i do partial throttle..

what I do is, usually will maintain 2500rpm, lets car beside fly to the moon then later usually will overtake them. most of them I see, drive slow later with the hope to save fuel, but fuel burn kaw kaw at the beginning they dont realize/care.kek.

fast launch doesn't mean burn rubber lah... aiyoh taken out of context a bit...hahaha... np

i meant fast/steady acceleration to cruising speed... so move through the gears quickly but do so without over rev, without dragging, or lugging when shifting up, is the key. 4k maybe over rev a bit that's why your fc suffer

anyways, most of the time i can meet manufacturers mileage claims...so i know i'm doing it right... also high speed do sap fuel...my cars have fuel meter so i know for sure

Cruising speed is the most efficient phase in any car..We use company car, my kolik drive at middle lane between 100kmh to 120kmh, but when times comes to overtake middle lane, he always rev, overtake then enter into middle lane back.kek. While me drive consistent 140kmh, very minimal rev. Even no use brakes, just let off from throttle if find slow cars.

U guess what, my driving style more economical.lol.

High speed may sap fuel, but its not as damaging as people think. But I do see if people drive fast they like brake hard when approaching slower cars then rev acceleration like mad want to achieve back high speed.

Its like high speed cruise but steady vs high speed but rough, got a lot of difference.

maruah tercabar lor.

you're complicating the issue.... constant 140 will use more gas than constant 100... for sure

and erratic driving style will hurt fc...as you know

Not far dude..100 can be as high as 140 if rough driving which is habit for malaysian.

100 definitely more fuel efficient than 140 on constant. thats is the facts. but 140,150,160 can be economical vs always rev lower speed.

Some people so proud drive slow, but he always accelerate and decelerate on the move. so economical throw to the sea.

We need to teach our citizen in order to hit good fc, minimize as low as possible acceleration and deceleration, not speed alone. thats no 1 fc killer. U can still can get good fc driving fast and constant, but u for sure cannot get good fc if rough during acceleration and deceleration.

This post has been edited by DM52: Nov 5 2020, 04:58 PM

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This post has been edited by set: Nov 5 2020, 05:19 PM

My idea it save fuel for bigger engine where even on 140kmh, rpm stay below 3k rpm

But if it a Viva Elite, at 140kmh the rpm hovering at 4.5k then it drink fuel a lot

yep. depends from car to car. Bigger engine and certain transmission definitely can afford to cruise at higher speed. For small engines like my persona and saga, even going 120kmh is worse than going 90kmh. Much less 140kmh. The engine needs higher RPM perhaps due to lack of power / lack of higher overdrive gears to cruise comfortably at high speed.

fuh..200kmh on empty road?. lol. u got balls of steel.


Lower power car not suitable to drive fast. it will consume more fuel. I remember see m3 vs prius. on high speed, prius eats more fuel over m3. kek.

and back to viva topic, I dont know why so many zoom fast fast flying on highway. its should be for fuel efficiency. but they all drive fast, beat the purpose. small engine drive up to 150kmh.kek. dunno what they trying to prove.

correct... high cc engines got enough torque/power to run more efficiently ~1.8k rpm @ 140 kmh than small cars... small cars will need to run at slower speed to be as efficient, if at same speed will drink a lot

This post has been edited by dwRK: Nov 5 2020, 07:49 PM

go-kart fun...until wrap around pokok...

let's just say i miss those mco days

before this I also believe, rush hour traffic jam stop and go crawling it's what destroy the fuel consumption,
but after 2 months of mco with me still going to work using the same route with 0 traffic, end up using more fuel

so I don't know what to believe now

This post has been edited by set: Nov 5 2020, 07:48 PM

Here's spreadsheet I developed to compare transmission of various car type at redline and 3000rpm. It shows their theoretical top speed if not limited by engine power or electronic.

More powerful engine can afford to have wider overdrive gear ratio thus cruise at lower rpm, it is the transmission.

Gearbox change speed and torque. A 10 to 1 (10:1) speed reduction gear set reduce the speed from driver to driven gear by 10x, it also amplify the torque by 10x. In overdrive, it is the other way round 1:2 ratio double the output speed, but drop the torque by half.

U dont specify how u drive nia..If free flow traffic use more fuel, then highway drive will burn more fuel than city stop and go. which is not the case for most cars

This post has been edited by DM52: Nov 5 2020, 08:54 PM

very attractive spreadsheet. u automotive engineer urself?. If u are, then please active more and correct those facts in k and f&f. lol.

last time got few automobile engineer here. but all no longer active. they found life outside maybe

Not related with automotive, just car enthusiast. But my work is need linear algebra and calculus, so this spreadsheet is relatively quite simple