MPG Fuel consumption skyrockets momentarily when stopping

Skaven252 · 14th November 2006, 07:41

There's this one thing I've been wondering about for a while. I approach red traffic lights at 40 km/h and switch to 2nd gear to engine brake a little. When the speed has dropped enough I press the clutch (to prevent the RPM from going too low and stalling the engine) and let the car glide into position. Almost every time I do this, the fuel consumption graph suddenly jumps over the top after the clutch is pressed, hogging something like 30 l / 100 km for a couple of seconds, then drops down to normal idle consumption. However, the RPM gauge doesn't jump up, nor I hear anything special.

Why does this happen?

Is it normal? Is it maybe just a glitch in the fuel usage meter?

cfcnick · 14th November 2006, 10:20

Don't know why this might happen, but wouldn't it just be better to use the brakes for 'braking' and the engine for 'going' as that is what they are designed to do!

Skaven252 · 14th November 2006, 10:27

Why, even the Honda manual states that it's a good idea to switch to a lower gear when slowing down.

Yeah... the matter has been debated here before...

emanems · 14th November 2006, 10:52

It's very easy. Because at 10km/h the consumption against the distance is very high. An really at 0km/h it would be infinite (this is maths) but they downs to 0 litres for not frightenig driver jeje

P.D. The comsumption at motor brake is near 0.

Skaven252 · 14th November 2006, 11:13

Ahh, so that's it! Just a pure maths error.

Thanks for clearing that out.

14th November 2006, 07:41	#1 (permalink)
Skaven252 Triangular Exhaust Join Date: 1st June 2006 Location: Espoo, Finland Posts: 239 Thanks: 0 Thanked 0 Times in 0 Posts	Fuel consumption skyrockets momentarily when stopping There's this one thing I've been wondering about for a while. I approach red traffic lights at 40 km/h and switch to 2nd gear to engine brake a little. When the speed has dropped enough I press the clutch (to prevent the RPM from going too low and stalling the engine) and let the car glide into position. Almost every time I do this, the fuel consumption graph suddenly jumps over the top after the clutch is pressed, hogging something like 30 l / 100 km for a couple of seconds, then drops down to normal idle consumption. However, the RPM gauge doesn't jump up, nor I hear anything special. Why does this happen? Is it normal? Is it maybe just a glitch in the fuel usage meter? Last edited by Skaven252; 14th November 2006 at 09:45.

14th November 2006, 10:52	#4 (permalink)
emanems Valve Cap Join Date: 14th November 2006 Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	It's very easy. Because at 10km/h the consumption against the distance is very high. An really at 0km/h it would be infinite (this is maths) but they downs to 0 litres for not frightenig driver jeje P.D. The comsumption at motor brake is near 0. Last edited by emanems; 14th November 2006 at 10:56.

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This thread is about: Fuel consumption skyrockets momentarily when stopping, it's in Engines and Transmission at the Honda Civic forum Civinfo; There's this one thing I've been wondering about for a while. I approach red traffic lights at 40 km/h and switch to 2nd gear to ...

14th November 2006, 10:20	#2 (permalink)
cfcnick Wheelnut Join Date: 4th October 2006 Location: Kent Posts: 51 Thanks: 0 Thanked 0 Times in 0 Posts	Don't know why this might happen, but wouldn't it just be better to use the brakes for 'braking' and the engine for 'going' as that is what they are designed to do!

14th November 2006, 10:27	#3 (permalink)
Skaven252 Triangular Exhaust Join Date: 1st June 2006 Location: Espoo, Finland Posts: 239 Thanks: 0 Thanked 0 Times in 0 Posts	Why, even the Honda manual states that it's a good idea to switch to a lower gear when slowing down. Yeah... the matter has been debated here before...

14th November 2006, 11:13	#5 (permalink)
Skaven252 Triangular Exhaust Join Date: 1st June 2006 Location: Espoo, Finland Posts: 239 Thanks: 0 Thanked 0 Times in 0 Posts	Ahh, so that's it! Just a pure maths error. Thanks for clearing that out.