Clubjazz - Honda Jazz & HR-V Forums
Honda Jazz Forums => Honda Jazz Mk4 2020 - => Topic started by: MRCLICKCLICK on October 24, 2020, 11:16:04 AM
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Hi All. got my crossbar in Mid Oct - just before we had a few days away. Here are the results so far.
No Econ selected. 2 front seat passengers - just above normal weight!! 2 large cases and other bags in the back so 1.5 extra passenger weight. Distance 300 miles. No motorway driving. Large portion 40 - 60 mph roads, some 70 mph Duals, 25% town driving. Both days out and back about 15 degrees air temp. Tyres are Goodyears.
First trip. Tank 3/4 full at start. Fuel average showed 56 mpg. Battery charge in the main was showing 35 - 65%. At times went down to 20% and very occasionally went to 100%.
Second trip. Tank full at start. Full average showed 57 mpg. Battery charge in the main was showing 35 - 65%. At times went down to 20% and very occasionally went to 100%.
Performance - well great. No hesitation either with foot light or heavy on throttle. Didn't do and Porlock like hills - but some were steep. On the odd occasion when I would have thought about passing a slow tractor with the HRV I didn't with the crossbar - just for down - and it went. OK - you could hear the engine in this state - but if the throttle was tight it was very quiet as as didn't get into high revs - so no noise. General ride was very quiet - depending on road surface of course. We could have the sound on quite low so we could actually talk without shouting but the road noise didn't really show. The sound system is excellent. It was so easy to forget the gears etc. No hesitation when accelerating - and it went like a bat out of hell unto about 60 mph - you were pushed back into the seats - on that matter we did stints of 2 hours - no problem - a full 7 hours of driving - no problem.
My conclusion is that if there are only 1 or 2 passengers the mpg will go up, also if you start with mainly town driving the mpg will go high very quick and fall slowly - so mpg of 60 will show - but if you go off at 60 mph on main roads the mpg will be lower - as per my drives - also the lower the tank as usual the better the mpg.
Am I pleased I changed - you bet.
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It's time to update your forum profile which says you are waiting to get your Crosstar.
I'm surprised by the mpg which is low compared to what I've achieved so far - 71 mpg based on fuel into tank. My last refill was over a month ago after a trip to/from and around the northern half of Wales. No motorway driving and rarely exceeded 60 mph but much cruising at around 50 mph. The car claimed 76 mpg for the trip but it was actually 73 mpg. The weather was warmer then than now which helps the fuel economy and I've always had Econ enabled. For comparison, a similar trip in my CVT HR-V would give around 52 mpg. As you note, around 60 mph seems to be the threshold where the fuel economy falls off (this is confirmed by the detailed WLTP test data) and I suspect the most economical speed is about 45 mph. That's not a specific Crosstar feature but those roof rails will add to the drag. My Crosstar is shod with Dunlop Enasave EC300 tyres. Perhaps they perform as the name implies.
Your other comments regarding noise, ride and responsiveness align with my own findings. It's a nice vehicle to drive.
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It's time to update your forum profile which says you are waiting to get your Crosstar.
I'm surprised by the mpg which is low compared to what I've achieved so far - 71 mpg based on fuel into tank. My last refill was over a month ago after a trip to/from and around the northern half of Wales. No motorway driving and rarely exceeded 60 mph but much cruising at around 50 mph. The car claimed 76 mpg for the trip but it was actually 73 mpg. The weather was warmer then than now which helps the fuel economy and I've always had Econ enabled. For comparison, a similar trip in my CVT HR-V would give around 52 mpg. As you note, around 60 mph seems to be the threshold where the fuel economy falls off (this is confirmed by the detailed WLTP test data) and I suspect the most economical speed is about 45 mph. That's not a specific Crosstar feature but those roof rails will add to the drag. My Crosstar is shod with Dunlop Enasave EC300 tyres. Perhaps they perform as the name implies.
Your other comments regarding noise, ride and responsiveness align with my own findings. It's a nice vehicle to drive.
Drag rises with velocity squared.
42.5 mph squared = 1,806 Indexed 100
60mph squared = 3,600 199
70mph squared = 4,900 271
So drag doubles roughly from 40 to 60mph and rises by nearly 70% more at 70mph..
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Thanks - changed profile!! I have seen that others think Econ not the best - will give it a try and see. Early days yet - so will see what now happens re fuel.
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It's time to update your forum profile which says you are waiting to get your Crosstar.
I'm surprised by the mpg which is low compared to what I've achieved so far - 71 mpg based on fuel into tank. My last refill was over a month ago after a trip to/from and around the northern half of Wales. No motorway driving and rarely exceeded 60 mph but much cruising at around 50 mph. The car claimed 76 mpg for the trip but it was actually 73 mpg. The weather was warmer then than now which helps the fuel economy and I've always had Econ enabled. For comparison, a similar trip in my CVT HR-V would give around 52 mpg. As you note, around 60 mph seems to be the threshold where the fuel economy falls off (this is confirmed by the detailed WLTP test data) and I suspect the most economical speed is about 45 mph. That's not a specific Crosstar feature but those roof rails will add to the drag. My Crosstar is shod with Dunlop Enasave EC300 tyres. Perhaps they perform as the name implies.
Your other comments regarding noise, ride and responsiveness align with my own findings. It's a nice vehicle to drive.
Eco tyres will give you a max 2% mileage increase, at a cost of a firmer ride...
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So drag doubles roughly from 40 to 60mph and rises by nearly 70% more at 70mph..
Thanks. I'm aware of the V squared relationship but would add that a head or tail wind can also make a big difference as it increases / decreases the speed of the vehicle through the air (any cyclist can tell you that a headwind is very undesirable). The amount of drag for an individual vehicle also depends on the drag coefficient, Cd, which is determined by the vehicle shape. In this respect the extra height of the Crosstar doesn't help while the boxy Jazz shape is worse than a saloon car.
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OK - just done another trip similar to the one I started the thread with - pleased. 2 up front, full fuel tank, little in boot. Now average up to 70 MPG - dropping to 63 when engine kicks in at height road speed - above 55 mph. Econ on as well as driving in B mode - no probs.
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These mpg figures are quite encouraging though, even the lower ones.
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Should you be driving continually in B mode. I thought you engaged B mode when you were going down long hills. Decent Braking!
I might be wrong of course.
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It all depends on personal preference. Coming from EVs, I feel more at home in B mode. I think regen is activated in D when the speed limiter is on anyway.
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It all depends on personal preference. Coming from EVs, I feel more at home in B mode. I think regen is activated in D when the speed limiter is on anyway.
Have you switched back from an EV to an ICE? If so, I’d be interested in your reasons, would you care to elaborate (maybe in the “Electric cars” thread https://clubjazz.org/forum/index.php?topic=9305.0 rather than here)?
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Yes - I had a Zoe, Model 3 and MG eZS over the last couple of years. The electric cars thread seems to have derailed into various energy related topics, so I’ll start a new thread explaining all perhaps :)
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Stick it on the Electric car thread. All the threads here wander on and off track. Adding some genuine electric car information may be what it requires to get back where it should be. Start another is just confusing, and it will soon go awol.
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Yes - I had a Zoe, Model 3 and MG eZS over the last couple of years. The electric cars thread seems to have derailed into various energy related topics, so I’ll start a new thread explaining all perhaps :)
Electricity supply and electric vehicles are inextricably linked....
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Right. Let us all agree that there is not enough electricity to charge electric cars and get back on to discussing the cars themselves on the Electric Car thread. I'll even start a new thread for electricity generation.