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Discussion Starter #21
Did you mean to say anything here in post #19? You quoted me but did not say anything.

 

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Discussion Starter #22
I see you've just registered. Welcome to Rav4World!

Could you provide some more insight into your suggestion? Have you changed yours? What year?

Most people's advice would not to touch that unless you have a clear case of fuel contamination.

I have attempted to change one and not only the nut seize, the fitting had to be cut off the fuel line and it was more to fix correctly than the worth of the car. Wasn't worth the hassle. They made a fitting and jimmyrigged it back together. The factory seems to have a knack for tightening the hell out of that banjo fitting. Like it was not ever meant to be taken out. Or do you mean something else...

Change the fuel filter.
 

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I see you've just registered. Welcome to Rav4World!

Could you provide some more insight into your suggestion? Have you changed yours? What year?

Most people's advice would not to touch that unless you have a clear case of fuel contamination.

I have attempted to change one and not only the nut seize, the fitting had to be cut off the fuel line and it was more to fix correctly than the worth of the car. Wasn't worth the hassle. They made a fitting and jimmyrigged it back together. The factory seems to have a knack for tightening the hell out of that banjo fitting. Like it was not ever meant to be taken out. Or do you mean something else...
I haven't personally done it on a RAV4, but fuel filters should occasionally be changed. They are relatively inexpensive as well.

Do you smell fuel anywhere around your car? If it is running fine, there could always be a leak which could make it seem like you are getting lower MPGs.
 

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2008 RAV4 Limited V6
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I'm having the same problem with my 2008 V6 with 65K miles. I keep track of mileage with an app called Car Minder. The most recent fill-up (08-24-19) showed the MPG at 14.32. The previous fill-up was a month before showing 14.81. But when we went to Disney World back in September with 4 passengers and luggage, the MPG was 27.72! My daughter has been using the RAV for the past 6 months and her short 3 mile commute to work may have something to do with it. She often has to wait in bumper-to-bumper traffic on the way home in the afternoon. Guess I'll have to jack up the RAV and check for a stuck caliper, but when I drove it yesterday, everything seemed normal.
 

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That 3 mile drive and sitting in traffic will tank the mpg. 3 miles barely lets it get up to temp if there isn't any traffic, so it's in warm up mode. The drive home sitting in traffic is just burning fuel.

I'm having the same problem with my 2008 V6 with 65K miles. I keep track of mileage with an app called Car Minder. The most recent fill-up (08-24-19) showed the MPG at 14.32. The previous fill-up was a month before showing 14.81. But when we went to Disney World back in September with 4 passengers and luggage, the MPG was 27.72! My daughter has been using the RAV for the past 6 months and her short 3 mile commute to work may have something to do with it. She often has to wait in bumper-to-bumper traffic on the way home in the afternoon. Guess I'll have to jack up the RAV and check for a stuck caliper, but when I drove it yesterday, everything seemed normal.
 

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Discussion Starter #26
This generation doesn't have ignition cables. If and spark plug wires were incorrectly installed on a distributor and rotor system, the car would barely run if at all start. On the distributorless Toyota V6 1MZ-FE, it has coils on the left bank and slave wires to the rears. But I like that you call her a beast. She truly is a mighty force.

My 2008 Limited V6 purchased new still gets 18 city / 25 highway - pretty darn close to when new.

My mechanical knowledge stops at the gas tank, so I'd listen to the folks who are suggesting the spark plugs be redone. If the cables were put on incorrectly, you're poor beast is fighting against itself (and your wallet).
 

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Discussion Starter #28
I did an early morning and late night run cross town (about 30 miles) in the last tank as a test. 15mpg more or less. No idling much. No use during hot times of day. Working on getting the plugs done. I know it is imperative to pull them and see. I half did the job on the V6 1MZ and it didn't solve the issue until the back ones were done.

I looked back at what you said. Do you have AWD? I was told my FWD doesn't have the transfer cast separate (tranny shared) or diff.

I wish mechanics around here didn't take advantage. They want $300 just to do the plugs. I'd do it, but the way this engine is designed, and it's (personal maintenance and owner) history, taking the plastic plenum off is the least of my worries. Removing the threads with the plugs is a big concern. Wish I could replace all the coils! But at $70 a pop x 6 that's a good chunk of change.

Would like to know if you've changed anything else in regards to the ignition system that could affect fuel? Maybe the front pre-converter air fuel sensors were done? The two before/upstream. Good onto you for the upkeep.

Just filled up today and was at almost 28 mpg.
 

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Discussion Starter #29
There's a trick about feeling for hot wheels but in my experience, they all felt hot in another Toyota V6 I had.

If you have access to live scan data, see if the front two air fuel sensors are still good. Apparently the heaters (black wires) go bad and cause it to run rich dumping fuel to allow the car to run without codes. In a few years the cat will go. Has happened to several of our Toyotas but starting to think this is the culprit. All of them around 15mpg since manual tracking back in the day and now I use Fuelio.

I'm having the same problem with my 2008 V6 with 65K miles. I keep track of mileage with an app called Car Minder. The most recent fill-up (08-24-19) showed the MPG at 14.32. The previous fill-up was a month before showing 14.81. But when we went to Disney World back in September with 4 passengers and luggage, the MPG was 27.72! My daughter has been using the RAV for the past 6 months and her short 3 mile commute to work may have something to do with it. She often has to wait in bumper-to-bumper traffic on the way home in the afternoon. Guess I'll have to jack up the RAV and check for a stuck caliper, but when I drove it yesterday, everything seemed normal.
 

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2008 RAV4 Limited V6
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This generation doesn't have ignition cables. If and spark plug wires were incorrectly installed on a distributor and rotor system, the car would barely run if at all start. On the distributorless Toyota V6 1MZ-FE, it has coils on the left bank and slave wires to the rears. But I like that you call her a beast. She truly is a mighty force.
The 2006-2012 RAV4 V6 uses the 2GR-FE engine, not the 1MZ-FE. But the rear plugs are still a PITA to change!
 

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Discussion Starter #32
I know it does. It says 2GR-FE right on the engine cowling.
I was just telling Tim about my familiarity with how much the rear plugs were easier on the 1MZ and didn't require removal of the plenum. Did it myself. I only mentioned it because he seemed to be talking to me about that generation of engine, as he mentioned wires and the 2GR doesn't have any, just coils.

For this 2GR, have you tried doing it without taking the plenum off? Seems like we just have to with this one.

Also, if you do ever get your daughter's car in for a diagnostic and can backprobe the heater circuits to see if they are fluctuating, do let me know. And the thing about feeling if any of her wheels are hotter than normal after a drive. Especially at night when one can tell better. Hoping for you none of the calipers are seized.

Update here and there day driving seems to net me still 12mpg. But night driving gets me 15mpg. Not sure why.

Swallowed the pill and bought an air/fuel sensor ($110) and hope that's it and that the mechanic can figure out which one is bad and hopefully not both. Tranny fluid is on the docket to be done. I'll monitor it if it does anything.

Doesn't have a separate transfer case or rear diff, but it has some strange whine I've yet to hunt down.

The 2006-2012 RAV4 V6 uses the 2GR-FE engine, not the 1MZ-FE. But the rear plugs are still a PITA to change!
 

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This generation doesn't have ignition cables. If and spark plug wires were incorrectly installed on a distributor and rotor system, the car would barely run if at all start. On the distributorless Toyota V6 1MZ-FE, it has coils on the left bank and slave wires to the rears. But I like that you call her a beast. She truly is a mighty force.
Yes - these beasts are mighty forces! Mine's at just over 100k, and I hope (dare I say "expect"?) for it to go another 100k. I mostly do suburban driving - officially in the city, but go downtown infrequently - with a few rides on a freeway each week. Fingers crossed!
 

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Discussion Starter #35 (Edited)
I'll give an update on this since everyone is doing updates. My biggest suspect is a combination of things. Hard to pinpoint. But I'm thinking a huge thing is the oil and filter change. It could be possible the previous owner put in really heavy oil. After that and changing out some really dry Goodyear's, mileage shot up to at least 15/16. Coincidence maybe, but it really does not like Costco has. Thinking the local mixed in some 91 in with the 87. Changed to 76 and it loves it. Counter to the usual thinking that winter fuel gets worse mileage, cold weather seemed to help. Been getting 16-18 mpg lately. Keeping tire pressure a little on the higher side. Transmission fluid changed however I doubt that did anything much. I did a trip and back of about 250 miles and mpg shot up to 20! Makes me wonder at that level the O2 sensor finally got to a good burn temp. Still have got to get around to pulling live data to see if the O2 heater inside the sensor isn't as good/efficient as it's supposed to be and giving bad reads to the computer. Yet not bad enough to throw the money light on. When I can get around to it, will update if anything new happens. 20 mpg was a fluke. Never drive that far in a day. Manual calculation. This year doesn't have the estimated in the cluster. Guess more flexy rubbers make a big difference.. will need to keep a closer eye on the night driving theory yielding better mileage or just happy happenstance..
 

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My 2010 awd gets bad fuel economy also. Though I have a short commute everyday(10min drive), I don't hit traffic and hardly any stop lights. Service records are clean and I only have 79,xxx miles...

Sent from my SM-G960U using Tapatalk
 

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Since new our '11 V6 RAV4 gets around 14-16 mpg in usual, mostly in-town driving, and 23-25 mpg in mixed usually rather aggressive twisty mountain and more straightline highway driving.
 
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