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Old 04-18-2019, 02:04 PM #1
Sr Auron Sr Auron is offline
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Poor highway mpg

I can seem to find a thread on this so if there is one, point me to it.
My highway mpg is worse than my city. My city is actually good at 16.5, but highway is maybe 14.6.
It's completely stock and I've only had it 2 weeks, so I don't know much about it. After changing plugs I reset to EFI as well.

If you think it matters, I also have a check engine code P0456.
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Old 04-18-2019, 03:17 PM #2
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V6 or V8 ?

I can tell you my V6, with winter gas blend I get around 17.5 country driving and 18 highway traveling around 70~75mph

Summer gas gets better overall mileage, 19 country and around 22 on the highway.


Your code could be a gas cap or other small leak in the evap system. Probably evap system, as the cap sets other lights.
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Old 04-18-2019, 03:21 PM #3
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V6 indeed. Any idea Why would only my highway mileage be effected.
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Old 04-18-2019, 04:01 PM #4
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I have a scan tool, what numbers should I check that could clue me on the issue.
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Old 04-18-2019, 04:21 PM #5
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Quote:
Originally Posted by Sr Auron View Post
I have a scan tool, what numbers should I check that could clue me on the issue.
Maybe check your fuel trims if your scanner can look at that live. That should tell you if the engine is running lean or rich and when.

ScannerDanner on youtube has some great videos explaining fuel trims if you aren't familiar with them.
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Old 04-18-2019, 08:16 PM #6
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I know in the summer when mine were working well

My 03 would get 21 MPG

My 08 would get up to 24 (currently running about 21)

The usual stuff for MPG is the air intake filter, spark plugs/coils, consider a fuel and exhaust cleaner. Otherwise, I wonder if its a cooling issue with your engine - if it is getting too hot, something rubbing on your wheels/ calipers/breaks creating drag
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Old 04-19-2019, 07:08 AM #7
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Quote:
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V6 indeed. Any idea Why would only my highway mileage be effected.
Lead foot?



You can Google the codes you get, obd2 is fairly standardized.
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Old 04-19-2019, 11:03 AM #8
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MY GARAGE
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possible frozen caliper, common issue.
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Old 04-19-2019, 03:25 PM #9
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Since we're throwing ideas into the pile. maybe it's not shifting into overdrive or the torque converter isn't locking up properly.
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Old 04-19-2019, 03:55 PM #10
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Quote:
Originally Posted by Montego Murph View Post
Since we're throwing ideas into the pile. maybe it's not shifting into overdrive or the torque converter isn't locking up properly.
That should be easy to check. Just count the shifts as you accelerate onto the highway. Or see how high your RPMs are at >60mph.

If the torque converter isn't locking up would that cause the "rumble strip" issue? I would think that would be easily noticeable too.
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Old 04-19-2019, 04:38 PM #11
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Frozen caliper(s) will haul down the fuel mileage noticeably. So will dirty MAF sensor and TB. I had dropped off from 22mpg highway to 19mpg, cleaned the MAF and TB, changed out the plugs just because, air filter was fine. Mileage slowly climbed back up to ~21mpg where it remains now (the dreamometer shows around 23mpg to make me feel better ). Easy to check the calipers if you have an IR thermometer - drive without doing much braking and then measure the temps of the rotors all around - you may find one or two significantly hotter than the others (significant being a couple hundred degrees difference in my case).
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Old 04-19-2019, 05:00 PM #12
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Quote:
Originally Posted by tom4416 View Post
Frozen caliper(s) will haul down the fuel mileage noticeably. So will dirty MAF sensor and TB. I had dropped off from 22mpg highway to 19mpg, cleaned the MAF and TB, changed out the plugs just because, air filter was fine. Mileage slowly climbed back up to ~21mpg where it remains now (the dreamometer shows around 23mpg to make me feel better ). Easy to check the calipers if you have an IR thermometer - drive without doing much braking and then measure the temps of the rotors all around - you may find one or two significantly hotter than the others (significant being a couple hundred degrees difference in my case).
Do you happen to know what type of plugs you had and what kind you have now? I was reading through some threads on here yesterday and a couple people said they switched to iridium and noticed a drop in mpgs.

I switched from copper to iridium a few thousand miles ago and noticed my mpgs dropped. It's either that or one of my calipers is sticking. I'm planning on replacing the calipers then waiting a couple thousand miles to see if the fuel economy improves. If it doesn't I'll switch the plugs back to copper and wait again. If that doesn't do it I'll try the MAF and TB. I would just do it all at once, but I really want to know which is causing the drop haha.
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Old 04-20-2019, 04:44 PM #13
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Thanks for all the input. I just cleared my codes to see if they come back, after a few adjustments. I'll have to grab mass airflow cleaner as well. How much does the pcv valve play into mpgs?
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Old 04-20-2019, 05:29 PM #14
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Quote:
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Thanks for all the input. I just cleared my codes to see if they come back, after a few adjustments. I'll have to grab mass airflow cleaner as well. How much does the pcv valve play into mpgs?
PCV valve should have very tiny effect on measurable MPG. Maybe check highway RPM's, tire pressure, and brakes of course
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