MPG Question - Honda CRZ Forum: Honda CR-Z Hybrid Car Forums

pmath1 · 02-10-2011, 10:15 AM

I've had my CR Z 6MT for three weeks now. So far, so good. Driven it 350 miles and fuel gauge is still showing four bars. Will probably have to get my first refuel in a couple of days. My question: In Eco mode, is there a certain speed on level, straight road in 6th gear that will optimize fuel economy? 40? 50? 55? Or should I focus more on keeping RPMs at a certain level? Thanks for any input.

wicked1 · 02-10-2011, 07:35 PM

RPM's would probably be the simplest one thing to be concerned with.
But, you'll get a feel for it.. it's a lot of variables.

Today I started trying to drive w/out ever pressing the pedal in enough to get IMA assist, as well as shifting before the up-shift indicator lights. It's a game I can only play when there are no other drivers around, and only on flat ground (or downhill). That got me some GREAT mpg, though. (and fully charged my battery)

BDF02M · 02-10-2011, 07:46 PM

It really seems to vary. When I commute I go a couple miles around 45MPH and a few more at 70MPH. Cruising at both speeds shows around 40-45MPG on the instant-read; at least when I'm going to work.
Coming back, it usually shows around 35-40 at 70MPH... not sure why.

(Perhaps I'm subconsciously in a hurry?)

sirjonsnow · 02-10-2011, 07:57 PM

Quote:

Originally Posted by BDF02M

It really seems to vary. When I commute I go a couple miles around 45MPH and a few more at 70MPH. Cruising at both speeds shows around 40-45MPG on the instant-read; at least when I'm going to work.
Coming back, it usually shows around 35-40 at 70MPH... not sure why.

(Perhaps I'm subconsciously in a hurry?)

Coming back you may have a slight incline or headwind (if your trip home is going west, for example).

varoom · 02-11-2011, 10:13 AM

I've had my car for about 2 mos now with about 2600 mi and I've found that driving mode, speed, etc. really seem to be minor factors in mpg economy. The biggest factors by far are 1. length of trip and 2. weather. Any trip less than 10 mi and my mileage really sucks, usually < 30mpg. And temps in the teens can count on worse mileage. A friend who owns a Prius tells me the same thing. A bit off topic, but I smile a bit when he tells me that although he gets perhaps 5-10 mpg mileage better than I do, he paid 5-6k more for his car without navi (which I have). I detected a slight note of envy when he related this.

tsh · 02-11-2011, 11:14 AM

I can now log MPG vs temp, road speed and RPM, so I might try some regressions on the data at some point.

pmath1 · 02-11-2011, 03:28 PM

First fill up: 392 miles divided by 9.4 gallons = 41.7 mpg. Avg speed for the tank was 37 mph. Drove mostly in Eco mode but tried sport a few times for fun. Very happy with this inital result.

wicked1 · 02-11-2011, 04:51 PM

Hey, everyone should post average speed from the car's info when posting their MPG.
My average speed is about 23mph, which might help explain my low mpg.

Colin · 02-11-2011, 05:06 PM

I need to look at it again, but I thought the Avg. Speed indicated was for the trip, not the entire tank?

JnC · 02-11-2011, 06:20 PM

It's not rocket science. For a flat road as long as you're not lugging the engine, the slowest speed in the highest gear will always be the most economical.

Wayne Gerdes of CleanMPG.com recorded the following during his original test drive stint of the CR-Z. These numbers should improve after the first oil change and engine break in:

Quote:

The Eco Mode based steady state - cruise control fuel efficiency numbers are as follows:

•45 mph - 58 mpg
•50 mph - 53 mpg
•55 mph - 49 mpg
•60 mph - 46 mpg
•65 mph - 43 mpg
•70 mph - 38 mpg

02-10-2011, 10:15 AM	#1 (permalink)
pmath1 Member Join Date: Sep 2010 Posts: 56	MPG Question I've had my CR Z 6MT for three weeks now. So far, so good. Driven it 350 miles and fuel gauge is still showing four bars. Will probably have to get my first refuel in a couple of days. My question: In Eco mode, is there a certain speed on level, straight road in 6th gear that will optimize fuel economy? 40? 50? 55? Or should I focus more on keeping RPMs at a certain level? Thanks for any input.

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02-10-2011, 07:35 PM	#2 (permalink)
wicked1 Senior Member Join Date: Sep 2010 Location: Midwest US Posts: 767	RPM's would probably be the simplest one thing to be concerned with. But, you'll get a feel for it.. it's a lot of variables. Today I started trying to drive w/out ever pressing the pedal in enough to get IMA assist, as well as shifting before the up-shift indicator lights. It's a game I can only play when there are no other drivers around, and only on flat ground (or downhill). That got me some GREAT mpg, though. (and fully charged my battery)

02-11-2011, 10:13 AM	#5 (permalink)
varoom Senior Member Join Date: Dec 2010 Location: Lewisburg, PA Posts: 261	I've had my car for about 2 mos now with about 2600 mi and I've found that driving mode, speed, etc. really seem to be minor factors in mpg economy. The biggest factors by far are 1. length of trip and 2. weather. Any trip less than 10 mi and my mileage really sucks, usually < 30mpg. And temps in the teens can count on worse mileage. A friend who owns a Prius tells me the same thing. A bit off topic, but I smile a bit when he tells me that although he gets perhaps 5-10 mpg mileage better than I do, he paid 5-6k more for his car without navi (which I have). I detected a slight note of envy when he related this.

02-11-2011, 03:28 PM	#7 (permalink)
pmath1 Member Join Date: Sep 2010 Posts: 56	First fill up: 392 miles divided by 9.4 gallons = 41.7 mpg. Avg speed for the tank was 37 mph. Drove mostly in Eco mode but tried sport a few times for fun. Very happy with this inital result.

02-11-2011, 04:51 PM	#8 (permalink)
wicked1 Senior Member Join Date: Sep 2010 Location: Midwest US Posts: 767	Hey, everyone should post average speed from the car's info when posting their MPG. My average speed is about 23mph, which might help explain my low mpg.