Best habit to shift gears on MT and fuel economy

[dssence]

Originally Posted by humfrz

Well, dssence, I think your math is suffering from a small representative sample.

I would suggest you fill up your car's tank with premium gas (til the pump clicks off) and re-set the trip odemeter to 0.

Drive, keeping the rpms below about 4,000, till the tank is down to 1/4 full. Fill up at the same station at the same pump (to click off). Divide the miles driven by the gallons of gas consumed (or kilometers/liters).

Do this about 3 times, checking your milage each time. This will give you a good idea of your average gas milage.

Then come back with your findings ......

yup that's what I'm gonna do, I'm gong to finish the tank filled up by my dealer. Which I don't know which octane fuel they've filled up with.
Question is,when should I fill up the tank, when I get the low fuel light on the dash?. Well I'll go for Shell vpower over here. When you said to drive below 4k, till tank down to 1/4, when I reach 1/4 (I would have to check the odometer partial km travelled) well 1/4 of the tank would be equal to 12.5 litres right?.
Now something else something I'm trying to figure, out cause I've heard the D4s engine uses one top injector and another one.. at certain car revolutions. How does that impact fuel economy.. are there certain RPMS where some of the injectors optimize for fuel efficiency. I'm not being a mouse trying to save in fuel . But one thing is to have a figure which is pretty much what every single ppl does have with the FRS and something compeltely different what I'm going through with half a tank 25 litres having done only 89 km that's not acceptable at any parameter.
ANyways I will do what you say I will make my second refill with Shells vpower. When you say to recharge again at the same pump on the same station you mean the same specific number of pump ? not a different number of pump on the same station? that actually might vary on the fuel dispensed?

[DarkSunrise]

Originally Posted by dssence

Hey so you mean to upshift before 3k rpm but didn't understand what you meant by upshift into the lowest gear? what for would you upshift into a lower gear? that would be to lower speed . Dont' get it

Doh typo! I meant to say, upshift into the highest gear possible. Sorry, I didn't mean to confuse you.

[dssence]

Originally Posted by DarkSunrise

Doh typo! I meant to say, upshift into the highest gear possible. Sorry, I didn't mean to confuse you.

heh no prob.

[Pete156]

Originally Posted by Cyau

I must disagree with you here. First of all, coasting downhill in neutral is somewhat dangerous, and it eats up brake pads a lot more.

Also, when you cost IN gear, you consume 0 gas, because your engine is driven by the "wheels".

However, if you coast NOT in gears but in neutral. You are actually consuming gas. The engine has to inject a small amount of gas into the engine in order to keep the engine spinning, or else the engine will stall.


Do correct me if I'm wrong though.

Coasting out of gear is technically illegal in most states.

Sorry, but you are wrong about coasting in gear. When you coast in gear, you do consume gas. If you didn't, your engine would stop running. The amount of fuel is indeed much less, but the engine is still burning fuel while coasting in gear. Even an engine driven by the wheels burns gas.

[Carlitoz3]

Originally Posted by Cyau

I must disagree with you here. First of all, coasting downhill in neutral is somewhat dangerous, and it eats up brake pads a lot more.

Also, when you cost IN gear, you consume 0 gas, because your engine is driven by the "wheels".

However, if you coast NOT in gears but in neutral. You are actually consuming gas. The engine has to inject a small amount of gas into the engine in order to keep the engine spinning, or else the engine will stall.


Do correct me if I'm wrong though.

What about at a stop light?

[dssence]

Originally Posted by Pete156

Coasting out of gear is technically illegal in most states.

Sorry, but you are wrong about coasting in gear. When you coast in gear, you do consume gas. If you didn't, your engine would stop running. The amount of fuel is indeed much less, but the engine is still burning fuel while coasting in gear. Even an engine driven by the wheels burns gas.

hey how on earth would you coast in gear , without pressing the gas pedal. the car would suddenly stop . don't get it. It would coast in gear but having the clutch pressed.

[Andrew025]

Originally Posted by dssence

hey how on earth would you coast in gear , without pressing the gas pedal. the car would suddenly stop . don't get it. It would coast in gear but having the clutch pressed.

Is this your first manual car?

[dssence]

Originally Posted by Andrew025

Is this your first manual car?

Nope , but believe it or not my previous car is cause I still have it a Toyota Celica GT 79 model . Big jump

[vinh359]

Dam my average is 19.8 in the city

[dssence]

Originally Posted by vinh359

Dam my average is 19.8 in the city

wow that's miles per gallon or litres per km ?

[vinh359]

Originally Posted by dssence

wow that's miles per gallon or litres per km ?

miles per gallon

[dssence]

Originally Posted by vinh359

miles per gallon

So if my calculations are not wrong, that's giving 201Km with half a tank ? (after how many tank refills, how was it when you first bought the car? )
Which fuel are you filling up with ?

[993Fan]

Originally Posted by Pete156

Sorry, but you are wrong about coasting in gear. When you coast in gear, you do consume gas. If you didn't, your engine would stop running.

This might be of interest...

http://www.popularmechanics.com/cars...l-fuel-economy

[vinh359]

Originally Posted by dssence

So if my calculations are not wrong, that's giving 201Km with half a tank ? (after how many tank refills, how was it when you first bought the car? )
Which fuel are you filling up with ?

I haven't driven anywhere far because I live in a big city. Never got a chance to drive far to test out the range. Every week I fill my tank with is 40 dollars with supreme 91 octane.