Several factors cause increased usage of fuel when it gets colder.

1. longer warm up times.

2. 'winter' gasoline blends

3. slower traffic on highways

One easy way to see if a thermostat is stuck 'open' is to feel the heater hose where the coolant enters the rad. (Unfortuately, this is on the BOTTOM on most Hondas) It should stay cold for 5 minutes of idling. Alternately, you could look at the coolant in the radiator. It should not appear to 'flow' when a cold engine is started.

 

One easy way to see if a thermostat is stuck 'open' is to feel the heater hose where the coolant enters the rad. (Unfortuately, this is on the BOTTOM on most Hondas)

Sorry, I thought that coolant flow was into the top of the radiator??
Cooled and flow back to the engine through the bottom hose of the radiator??

Live and learn

 

Is the temp Guage HIGH? not my vid but informitive

 

^^ Your experiences mirror ours, with regards to ECU coolant temp sensors (which are usually mounted in the cylinder head).


All I can suggest, is to try this test:

Fill up gas tank. note odometer.

Then, on the same drive, go at least 100 miles. Fill up again and note odo before going home.

That will eliminate the effects of cold weather warm up.

Calculate MPG (don't rely on the car display, if equipped). Report back (and tell us what type of driving you did: City, suburban, highway)

++++++++++++

PS: I don't think it is this, but a bad (or marginal) O2 sensor could affect MPG.

 

^^ Your experiences mirror ours, with regards to ECU coolant temp sensors (which are usually mounted in the cylinder head).


All I can suggest, is to try this test:

Fill up gas tank. note odometer.

Then, on the same drive, go at least 100 miles. Fill up again and note odo before going home.

That will eliminate the effects of cold weather warm up.

Calculate MPG (don't rely on the car display, if equipped). Report back (and tell us what type of driving you did: City, suburban, highway)

++++++++++++

PS: I don't think it is this, but a bad (or marginal) O2 sensor could affect MPG.

Ive been doing 200 mile check fillup since i bought the vehicle, and in suburban/highway driving getting 30+ mpg consistently. The car runs identically as before despite the small decrease. I run the car with eco off since i dont like to lug the engine, but ill turn it on to see if that changes things.

 

I'm willing to bet its a Winter Fuel blend result.

 

Well, mileage is the same warm or cold so who the heck knows. Runs great,idles fine, just a 2-3 mpg drop overnight. Guess i'll wait for a code.

 

I have 2013 CRV which has the same low heat issue on the driver side. Maybe you are having the same issue which is related to the fix that's specified here. Low Heat From the Driver’s-Side Vent – 2012-2014 Honda CR-V | Honda & Acura NOTE - This fix didn't solve my issue.

 

I have 2013 CRV which has the same low heat issue on the driver side. Maybe you are having the same issue which is related to the fix that's specified here. Low Heat From the Driver’s-Side Vent – 2012-2014 Honda CR-V | Honda & Acura NOTE - This fix didn't solve my issue.

Welcome to the forum, amodi! How great is it that it is your first post, and you are offering a possible resolution, even a link! Thank you!

 

The condition still exists. Noticeable decrease/increase in mileage as the weather becomes more or less frigid. Another issue is a short cut out or stall condition on sharp right turns. Foot off gas and back on resolves this. Seems like its stability control but still does it occasionally with VSA off. Shrug, gas filter?, runs superb otherwise.

 

So lets ask how many lost miles did you write down, from the 2 months driving.

 

I've been basing the mileage on a 200 mile fillup schedule, and get my gas exclusively from Mobil. Depending on temperature, I've seen 25.x - 28.x mpg since cold weather. Summer mileage was consistently over 30 mpg. My driving habits have been quite typical. I do the math every time. The mileage estimate counter also shows the decrease accurately, as well as the gas gauge hash marks. I watch the upside on days over 40 degrees on the mileage estimator consistently.