Got the latest June '10 software update!
#231
Re: Got the latest June '10 software update!
Hmm, your point about DLG (driving like granny) is interesting. I've definitely found that when I can use a faster acceleration to speed and then cruise a bit, I do better (as described in Terrabell's lovely discussion), but I have a hard time doing this without chewing through my SOC; I often don't have enough cruising time/distance to recovery the IMA charge that I've lost ...Have you found any tricks that help with this?
#232
Re: Got the latest June '10 software update!
Philip, you may want to specifically research city driving techniques for the HCH that might help you. I have the new software, and am averaging an indicated 46.1 MPG with about 200 miles on this tank of all-city driving — lots of stop-and-go, full use of A/C in "Auto" mode, and some hills. My actual computed mileage should be a couple of MPGs better. Disclaimer: I am running 44 PSI in my tires and using synthetic 0W-20 oil. Overall, my fuel economy continues to be 5-10 MPG better than before the software update. I think many people try to 'granny' their HCH's acceleration in the city, and therefore never maximize its optimal cruising fuel economy. That single lesson has made a HUGE impact on my city economy.
FWIW, I get anything between 44-48 in city in warmer weather; and 35-40 in winter weather in the city. 37 PSI in warmer weather (I empirically noticed higher PSI does not have much effect in warmer temps) and ~40 PSI in winter.
Cheers,
-ag
#233
Re: Got the latest June '10 software update!
Hmm, seems like Steve, you've answered my question (at least partially, just as I hit Post).
And I agree with you on the amount of engine/transmission oil. Excess robs MPG.
I tend to hardly ever use the climate control (auto) in summer or winter. Perhaps on longer drives in summer, I tend to use it. My guess is that your use of the A/C triggers more (almost hidden( one-bar charging ala turning on the headlight, and thereby prevents excess assist?
And I agree with you on the amount of engine/transmission oil. Excess robs MPG.
I tend to hardly ever use the climate control (auto) in summer or winter. Perhaps on longer drives in summer, I tend to use it. My guess is that your use of the A/C triggers more (almost hidden( one-bar charging ala turning on the headlight, and thereby prevents excess assist?
#234
Re: Got the latest June '10 software update!
I use the auto setting on the climate control.I set it as high as I can stand and still be comfortable. You have to remember the pack is cooled by this same system. So be comfortable for your pack sake! A hot pack will have a short life. H
#235
Re: Got the latest June '10 software update!
I used to accelerate so slowly that I'd take twice the time to get to cruising speed, never realizing that I was belaboring the ICE mode and reducing my cruising time. I still don't accelerate fast, by any means, but I am clear that I'll do better by getting to my desired speed where I can then coast with ease. By practicing, you'll find the right balance.
#236
Re: Got the latest June '10 software update!
Funny, your 'DLG' acronym. My #1 gauge is my SOC, which I watch like a hawk. My city acceleration is not rocket-like, but "purposeful." I aim for the sweet spot between 40-55 MPH. Additionally, I try to be very mindful of pedal pressure, so that I am cruising rather than engaging the ICE whenever possible. I find that minor speed adjustments can give unexpectedly big fuel economy rewards. That's about all I do, as a lazy city hypermiler. But it's enough to consistently get me into the upper-40s. I always use "Auto" A/C and find that it doesn't ding fuel economy much at all. Buy your synthetic oil on sale and take it to the dealer. Oh, and remember that even a 1/2-quart overfill will certainly rob you of 5+ MPG. My dimwit dealer mistakenly added all four quarts, thinking he was doing me a favor, and my fuel economy plunged to an all-time low... I took it back and had the excess half-quart of oil removed, and my fuel economy immediately skyrocketed to its current best-ever level. The dealer was unaware of the HCH's extreme sensitivity to oil overfills. Sorry to repost this reminder, but it bears repeating to those who may misidentify or wrongly attribute the source of their car's poor fuel economy.
Hmm, I'll definitely check whether they overfilled the oil at my recent service. I'd forgotten about that. Probably a stupid question, but how full is 'full' on the dipstick? Is the fill line a reliable max. optimum, or should the level be kept a bit below the fill line?
I'm not sure what to do about the AC. I usually just toggle it on and off as my defroster needs it; most of the time, it seems like the auto setting ends up blasting me more than I want it to, while my car is running at less than fully warmed up.
Philip
#237
Re: Got the latest June '10 software update!
Philip, I also live where there are extensive hills. I have a 2-mile uphill to my house, so have spent a lot of time considering the best strategy. I've found that downshifting from 'D' on uphills will greatly preserve my SOC with no noticeable FE downside. On downhills, you can often recharge quicker by downshifting, as well. Downshifting one 'gear' seems to have many worthwhile rewards with the new software updates.
As far as the oil level, I can't recall for sure what the dipstick level should indicate... but it seems that it was at or below the midpoint of the MIN and MAX levels. If you're at the top mark or close to it, you're too high.
As far as the oil level, I can't recall for sure what the dipstick level should indicate... but it seems that it was at or below the midpoint of the MIN and MAX levels. If you're at the top mark or close to it, you're too high.
#238
Re: Got the latest June '10 software update!
Philip, I also live where there are extensive hills. I have a 2-mile uphill to my house, so have spent a lot of time considering the best strategy. I've found that downshifting from 'D' on uphills will greatly preserve my SOC with no noticeable FE downside. On downhills, you can often recharge quicker by downshifting, as well. Downshifting one 'gear' seems to have many worthwhile rewards with the new software updates.
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Philip
#239
Re: Got the latest June '10 software update!
thanks for the tips; I 'discovered' the trick of downshifting on the downhill to recover charge, but I've not tried it on the uphill. How fast will you take your car in S? I grew up with manual transmissions and don't have a good sense of how far I can push it in S (or L) without causing undue strain. I HAVE read the manual btw, but would welcome your input!
Philip
Philip
I tend to not use the A/C in winter for the same reason, Philip, it tends to try too hard to warm up the interior. I am usually wearing my jacket, etc. so I don't feel too cold.
Harold, in summer, that is what I do. However, I don't need to use the A/C to keep the interior relatively nice for too many months where I live.
#240
Re: Got the latest June '10 software update!
I use 'S' exactly the same as btownmadness, except I use my A/C year-round. I've driven freeway speeds in 'S' without realizing that I forgot to shift back to 'D.' Not a problem. Hope these simple tips will help some — try them, and then report back here!
P.S. Tonight I observed my ordinary rate of acceleration – it's around a steady 2,000 RPM. Then I cruise as close to 1,000 RPM as possible without losing speed, generally around 1,100 while observing the Instant Fuel Consumption gauge and trying to peg it at its maximum. Often I'll do a 'false shift' where I briefly let up on the accelerator – often I can get it to register much higher fuel economy with this technique.
P.S. Tonight I observed my ordinary rate of acceleration – it's around a steady 2,000 RPM. Then I cruise as close to 1,000 RPM as possible without losing speed, generally around 1,100 while observing the Instant Fuel Consumption gauge and trying to peg it at its maximum. Often I'll do a 'false shift' where I briefly let up on the accelerator – often I can get it to register much higher fuel economy with this technique.
Last edited by stevenvillatoro; 01-08-2011 at 11:41 PM. Reason: Added a P.S.