Author Topic: MPG for those interested.  (Read 76374 times)

John Ratsey

  • Approved Member
  • *
  • Posts: 1539
  • Country: gb
  • My Honda: 2016 Blue HR-V SE CVT
Re: MPG for those interested.
« Reply #360 on: December 06, 2019, 06:56:34 PM »
Another thing (I'm sure many mentioned that before): cold engine mpg. Just started drive short  distance after 2 days (average temp outside 6-10C) and get only 26 mpg after 7 miles trip to shop.
This is one of my complaints. I think Honda could have done more to help the engine warm up quickly but when fuel efficiency is tested using pre-warmed engines there was no incentive to address this aspect. Now the fuel economy tests include some "real life" conditions the vehicle manufacturers have started to do something. The current CR-V has moveable louvres (or similar) on the air intake for the engine compartment - the modern equivalent of drivers blocking off half the radiator in a previous era (when it was more accessible). I hope that the Mk 4 Jazz has a similar feature, maybe more.

My current work-around is to turn off the cabin heating for the first few minutes of a cold start journey to give the engine some help in getting warm.

Jocko

  • Approved Member
  • *
  • Posts: 5840
  • Country: scotland
  • Fuel economy:
  • My Honda: 2006 GD5 Jazz 1.2 i-DSi S in Vivid Blue Pearl
Re: MPG for those interested.
« Reply #361 on: December 06, 2019, 10:01:55 PM »
My current work-around is to turn off the cabin heating for the first few minutes of a cold start journey to give the engine some help in getting warm.
I never turn the heater on until the blue light goes out, and when it is below zero, I leave it a couple of minutes after that. In really low temps the blue light has gone out, I have immediately turned the heating on, and the light has come back on. Especially at high fan settings.

Kenneve

  • Approved Member
  • *
  • Posts: 454
  • Country: gb
  • My Honda: 2019 Mk3 EX CVT, Red
Re: MPG for those interested.
« Reply #362 on: December 06, 2019, 10:52:05 PM »
If you set the heating to Auto, in my EX, the fan won't start until the blue light has gone out, which in effect is the same as what Jocko says. Obviously Honda have done this to ensure that the engine warms up quickly.

peteo48

  • Approved Member
  • *
  • Posts: 1833
  • Country: gb
  • I have entered the Jazz Age
  • Fuel economy:
  • My Honda: 2020 Honda Jazz 1.3 EX Navi CVT Shining Grey
Re: MPG for those interested.
« Reply #363 on: February 21, 2020, 01:26:21 PM »
Little quirk or possibly not on my new Jazz. All the Jazzes I've had to date exaggerate mpg by about 10% on the computer - this is usually about 4 mpg give or take.

Done 2 fuel ups on the new car. The first was 39.3 actual, 41.2 computer. Today's fuel up is 49.6 actual but 51.8 on the computer.

Never had the computer come this close to the actual figures before. 2 fuel ups is not a lot but I'm wondering if any tweaks have made the computer more accurate or do the 16 inch wheels make a difference? I guess a true pattern might emerge after a few more tanks.

Jocko

  • Approved Member
  • *
  • Posts: 5840
  • Country: scotland
  • Fuel economy:
  • My Honda: 2006 GD5 Jazz 1.2 i-DSi S in Vivid Blue Pearl
Re: MPG for those interested.
« Reply #364 on: February 21, 2020, 04:33:04 PM »
That's about the error I see on my Mk 1. Last top up was 54.3 for an actual 52.1.

langserve

  • Approved Member
  • *
  • Posts: 14
  • Country: jp
  • Fuel economy: [
  • My Honda: gk3 2019 jdm 1.3 CVT
Re: MPG for those interested.
« Reply #365 on: April 18, 2020, 03:26:06 PM »
I have almost 10 months of data and the error is about 10% for my new GK3. On my much missed GD1 it was 11%. I rather suspect Honda know exactly what they are doing and are deliberately overstating by 10% in the interests of consumer satisfaction. How many people actually check I wonder?

Incidentally my averaged economy for the GD1 was 31 mpg and for the GK3 it is 38.4 mpg. I've been doing a fair bit more long distance driving recently but the GK3 is clearly outperforming. You folks are clearly doing a lot better than me which I think is because of a lot of very short distance stuff and the fact the aircon has to work so hard in the summer. Perhaps I am a bit heavy footed as well.
« Last Edit: April 18, 2020, 03:31:19 PM by langserve »

peteo48

  • Approved Member
  • *
  • Posts: 1833
  • Country: gb
  • I have entered the Jazz Age
  • Fuel economy:
  • My Honda: 2020 Honda Jazz 1.3 EX Navi CVT Shining Grey
Re: MPG for those interested.
« Reply #366 on: April 18, 2020, 04:01:45 PM »
With the lockdown I'm doing very few miles - about 60 in total since early March and these are odd trips for shopping etc. I'm showing 38.8 on the car's computer but it's probably about 35 in real terms.

Tags:
 

Back to top