Author Topic: MPG for those interested.  (Read 79265 times)

John Ratsey

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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

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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

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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

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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

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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

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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

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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.

Redstart

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Re: MPG for those interested.
« Reply #367 on: August 02, 2020, 10:38:38 PM »
My best for my 68  1.3s is 62 on a 22 mile journey. It did 56mpg this weekend on a 491 mile trip to France and back. Fully loaded with French goodies on the return leg !!

Jocko

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Re: MPG for those interested.
« Reply #368 on: August 02, 2020, 11:02:39 PM »
Best to do the calculations at fill-up time. You can use Fuelly.com or the like.

TnTkr

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Re: MPG for those interested.
« Reply #369 on: August 19, 2020, 08:40:09 AM »
My first about 2000 kms' average fuel consumption calculated from my manual records is 6,3 l/100 km (about 37 mpg). For reference, car display states 6,0 l/100 km for the same time and kilometers. Those kilometers include some longer journeys in addition to my regular daily driving.

Paul22118

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Re: MPG for those interested.
« Reply #370 on: August 19, 2020, 01:25:31 PM »
Overall, motorways, short journeys, bit of town driving and long rural = 47.5mpg

TnTkr

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Re: MPG for those interested.
« Reply #371 on: August 20, 2020, 06:00:13 AM »
I made a one day work trip to the other side of the country. I concentrated on minimizing travel time, not optimizing the fuel consumption. Almost all highway (no motorway), mostly without AC, with average speed of 79 km/h the calculated fuel consumption was 5,3 l/100 km (44 mpg). Dashboard computer showed 5,1 l/100 km.

peteo48

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Re: MPG for those interested.
« Reply #372 on: September 09, 2020, 11:05:56 AM »
Just had another fill up that was very close to the computer and I'm now wondering if the CVT removes some of the variables in a manual.

A caveat in that I was just topping off prior to a trip away this weekend so I had only done 100 miles but the fibometer said 45.2 and the calculation via Fuelly showed 44.2.

Downsizer

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Re: MPG for those interested.
« Reply #373 on: September 09, 2020, 09:56:41 PM »
Just had another fill up that was very close to the computer and I'm now wondering if the CVT removes some of the variables in a manual.
Ive not found that - see my 3 year figures in a quote from 2019:  Ive just completed 3 years and 30636 miles, using 2738 litres of mainly ASDA 95, giving 50.9 mpg.  Trip B has been running throughout without resetting and is showing 55.8 mpg, a discrepancy of 9%.  Average speed shown as 35 mph.

peteo48

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Re: MPG for those interested.
« Reply #374 on: September 10, 2020, 09:56:32 AM »
Interesting. My accurate figures might well be a quirk as I have only done 1700 miles in this car so far. It'll be interesting to see the figures after this weekend when I will be doing around 300 miles.

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