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Discussion Starter · #1 ·
Hi all,

My 2005 CRV, which I bought about 3 months back(134k Kms on), seems to have quite bad fuel economy, about 13-14L/100kms on mixed city and highway usage.

The car was serviced just after I got it, and doesn't really have any issue wrt how it runs and drives. I fill-up 95 octane, and using FUCHS 5w-40 engine oil (as the mechanic raved about it). I drive quite conservatively and don't put much stress on the engine. Pickup and power seem to have no issue.

What might be the cause of bad fuel economy? Is it just the age of the car and it is to be expected?

It becomes rather expensive to take the car on longer trips with this fuel economy, combined with current fuel prices!

Many thanks!
 

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Everything in Moderation
2006 CR-V EX, 5MT
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13,992 Posts
that's not quite 17 MPG.
Manual or automatic?
2.0L or 2.4L?

We get 22 - 26 MPG on highway trips, ~ 25 in suburban driving.

134KM on the car is only 83,000 miles. Perhaps you need to do some of the services based on TIME. Such as: valve-lash adjustment and spark plugs (which should be the Iridium type)
 

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Discussion Starter · #3 ·
that's not quite 17 MPG.
Manual or automatic?
2.0L or 2.4L?

We get 22 - 26 MPG on highway trips, ~ 25 in suburban driving.

134KM on the car is only 83,000 miles. Perhaps you need to do some of the services based on TIME. Such as: valve-lash adjustment and spark plugs (which should be the Iridium type)
Hi Carbuff2,

It is 2.4l automatic.

What other things I should ask the mechanic to look at? I am a noob when it comes to these things, and the mechanic didn't mention any of these things when I got it serviced.

Does type of fuel makes a lot of difference? Don't mind switching to 98 if that can get the numbers up by 20%.

Thanks!
 

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Everything in Moderation
2006 CR-V EX, 5MT
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You certainly will not improve economy 20% just by burning higher octane fuel. Waste of money.

When was the last time that transmission fluid was replaced? Is the engine air filter clean? Any broken vacuum lines, or cracks in the ribbed intake duct between throttle body and air filter?

Have you tried filling the petrol tank, running for 120 km, then refilling? Sometimes that will help establish a fuel economy baseline.
 

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Discussion Starter · #5 ·
You certainly will not improve economy 20% just by burning higher octane fuel. Waste of money.

When was the last time that transmission fluid was replaced? Is the engine air filter clean? Any broken vacuum lines, or cracks in the ribbed intake duct between throttle body and air filter?

Have you tried filling the petrol tank, running for 120 km, then refilling? Sometimes that will help establish a fuel economy baseline.
Don't think the transmission fluid has been replaced. I checked it a few days back and it didn't appear very dirty/black. I do plan to have it changed at next service. The mechanic didn't have the Honda atf at the time, and I didn't want to put in anything else.

The air filter is clean and there don't seem to be any leaking or broken hoses. The hoses aren't hardened/dried out and actually look pretty good.

The number I posted is actually and average of 2 full tanks, so should be pretty accurate.


Can bad transmission fluid cause such a drop in economy?

Thanks!
 

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2018 EX-L fwd
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You can check what US CRV drivers are getting at this site: Honda CR-V MPG - Actual MPG from 6,814 Honda CR-V owners

Regarding your present mileage, please check out my report of our 2009 extended trip with our 2008 V with the same 2.4L engine: 2009 road trip mg

IIRC, the 2.4L on our 2008 V only used 5W-20 for U.S. engines, 5W-30 for the rest of the world. This is what the FUCHS site says: Lubricant advisor . Try changing your motor oil to what is recommended [should say on your oil filler cap] by Honda.

Do you know if your engine has had its valves adjusted? Have your mechanic check if they need adjusting. Improper valve adjustment can cause a host of problems, most serious being that a valve drops & ruins your engine.

Finally, have your mechanic check your vehicle for any stored codes, which may indicate where your fuel problem resides.
 

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2014 CRV AWD (my wife's baby)
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297 Posts
Things that help:
  • Proper sized rims / tires
  • All season tires instead of knobby M&S tread design
  • Proper tire pressure
  • Wheel alignment
  • NO dragging brake caliber (check each hubs for different operating temps)
  • AC set to OFF (set to ON sucks HP to turn its compressor).
  • Windows up - lowered windows creates wind drag.
  • Remove stuff off its roof rails (that creates wind drag).

Each of these things help as well....
 

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1999 CRV Lx
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1,016 Posts
Italian tune up.
Get rid of excess weight.
Use 30 weight engine oil ( 5w30, 10w30) unless Honda calls for 40. Idk where its your location but your engines oil cap(US) list which oil to use. Thinner helps with F.E.

Learn hypermiling techniques except turning engine off when approaching a red light. Don't do that.
If you really want to go deep on F.E. get a vacuum gauge and watch you tube vids explaining how to use it for F.E.

Driving habits will help the most if vehicle is in shipshape.

Lots of things more to add but those are helpfull.
 

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Discussion Starter · #9 ·
Things that help:
  • Proper sized rims / tires
  • All season tires instead of knobby M&S tread design
  • Proper tire pressure
  • Wheel alignment
  • Dragging brake caliber (check each hubs for different operating temps)
  • AC set to ON (that sucks HP to turn its compressor).
  • Windows up - lowered windows creates wind drag.
  • Stuff on the roof rails (that creates wind drag).

Each of these things does help (or make MPGs worst).
Thanks!

I have gone thru these and don't see any issues with these.
You can check what US CRV drivers are getting at this site: Honda CR-V MPG - Actual MPG from 6,814 Honda CR-V owners

Regarding your present mileage, please check out my report of our 2009 extended trip with our 2008 V with the same 2.4L engine: 2009 road trip mg

IIRC, the 2.4L on our 2008 V only used 5W-20 for U.S. engines, 5W-30 for the rest of the world. This is what the FUCHS site says: Lubricant advisor . Try changing your motor oil to what is recommended [should say on your oil filler cap] by Honda.

Do you know if your engine has had its valves adjusted? Have your mechanic check if they need adjusting. Improper valve adjustment can cause a host of problems, most serious being that a valve drops & ruins your engine.

Finally, have your mechanic check your vehicle for any stored codes, which may indicate where your fuel problem resides.
Thank you!

Out of all things, then engine oil seems to be the biggest factor. I will have it changed to 5w30 and see if that improves the fuel economy. Unfortunately the cap doesn't mention the oil type.
 

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2021 Honda CRV Sport
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371 Posts
Hi Vinay, Welcome to the forum.

The bad fuel economy could be a number of things. Bad fuel economy could be a bad oxygen sensor, dirty fuel injectors, old spark plugs, clogged fuel filter, uninflated tires. So its a process of elimintion.
Start with getting basics done. Check if the major maintence has been done. As others have mentioned, transmission fluid, spark plugs, valve adjustment and check if any of the hoses are cracked or damaged. Stick with the recommended oil, 5w/20 or 5w/30. Don't sencond guess Honda.
If you can, find a independant Honda specialist shop or a mechanic that specialises on Japanese vehicles. Ask them to give the car a once over and look at the engine seals.
Get a basic OBD Code reader and see if there are any codes. Its really easy to do.
 

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Premium Member
2017 CRV Touring - Pearl White w Black Interior
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17 year old vehicle, so it could be a range of small things all nipping at your fuel economy. Most of them already covered by posts above. But I would add driving speed, road conditions, and other environmental factors to the checklist here. Also fuel and emissions systems should be checked for leaks.

Has anyone put an OBDII reader on it to check for any fuel related codes, checked fuel trims, etc? Normally you get an alert on the instrument panel and then seek OBDII codes, but for something like this, you might want to check fuel trims and other fuel aspects of vehicle operation for any out of bounds results.

Can you describe your typical type of driving for one full tank of fuel? I ask because how you drive matters.

Example: is it mostly highway driving at speed? If so, what speed? What road conditions (I know roads vary in Aus)?

OR

Example:
is it mostly short trip driving at lower speeds with stop and go driving to some degree?

This generation CRV was not known for stellar fuel economy, but they were built rugged like tanks and run like tanks for the most part. If your driving is a blend of speeds, roads, etc. I would expect you to get north of 20 mpg (in your liters/100km equivalent), but it will not be much above 20. So, basically so far you are seeing about 15% less fuel economy and that could easily be a little thing here, a little thing there, etc in a 17 year old CRV and may simply not be worth chasing each one.

I guess if driving habits and road conditions do not pan out as a cause, best to take it to a specialist in Honda service and simply describe the problem and ask for an evaluation as to cause(s). From there you can decide what to "do yourself" vs what to have the service specialist address directly.
 

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After reading what was said so far. I would put some Techron cleaner in the gas tank.
 
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I'd rule out 'age of car'. You have very little mileage on the car. As others suggested, I would do a valve adjustment and drain Trani pan and refill. The friction properties in the fluid might be at end of life. If the timing belt was changed(does the 2005 have belt or chain?) it may have been installed one tooth off on one of the Cams. It would start and run fine but valves are not fully closing when they should. Makes you get your foot into the gas more.
 

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What I heard in a video in a modified civic (same engine as CRV in that year) changing original oil pump to an electric one would free a 20hp, reducing weight, driving less, anything else would be useless or not noticeable in my opinion and experimentations, hypermiling does a little help
 

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33.6 MPG = 7 Liters/100 KM (I looked it up). I'd be over the moon with that on my 2003 EX, but I have always gotten 17 mpg since I've owned it (over 50,000 miles).
MAF (Mass airflow ) & Oxygen sensors: One before catalytic converter (upstream) and the other after post catalyc converter -downstream-
Just my two cents
 

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Hi all,

My 2005 CRV, which I bought about 3 months back(134k Kms on), seems to have quite bad fuel economy, about 13-14L/100kms on mixed city and highway usage.

The car was serviced just after I got it, and doesn't really have any issue wrt how it runs and drives. I fill-up 95 octane, and using FUCHS 5w-40 engine oil (as the mechanic raved about it). I drive quite conservatively and don't put much stress on the engine. Pickup and power seem to have no issue.

What might be the cause of bad fuel economy? Is it just the age of the car and it is to be expected?

It becomes rather expensive to take the car on longer trips with this fuel economy, combined with current fuel prices!

Many thanks!
My 05 crv has the same motor and 327,000 miles. It gets 24_26 mpg. Is there a check engine light on? Possibly a clogged converter due to leaking fuel injector or something. Maybe bad AF sensor. Whatever it is it's the type of thing that will cause more harm
 
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