Increadible V-6 gas milage

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Incredible V-6 gas milage

On 4.0 V-6 4WD Sports (driven in 2wd mode) I got whoping 15.8 miles per galon last month! Month before it was 16.0 mpg. I have new air filter, new syn oil and new spark plugs since 16.0 mpg in may. I use 89 octane fuel. I will try Premium next month. if premium does not increase milage by 3 mpg than no point using 91 for any $avings.
 
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On 4.0 V-6 4WD Sports (driven in 2wd mode) I got whoping 15.8 miles per galon last month! Month before it was 16.0 mpg. I have new air filter, new syn oil and new spark plugs since 16.0 mpg in may. I use 89 octane fuel. I will try Premium next month. if premium does not increase milage by 3 mpg than no point using 91 for any $avings.
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I filled up today and I got 18.9 mpg on this tank of 87. Not bad for a 100K mi ,03' - 4wd running 55-80mph up and down the highway with the AC blasting. A lot of it was stop and go traffic too. If I'm gentle I can get numbers like this all the time. Most of the time I'm in the 16-17mpg range. I can break tthe 20mpg mark cruising on all highway trips on occassion.
 
When I purchased my 05 T4R Sport 4X4 V6 I filled it up for months with 93 octane fuel and the fuel mileage was never really that great,16/18 mpg.When gas prices started to rise and the newness wore off a little I was at the pump and filled it up with 87 octane fuel and noticed more miles per tank full.I called the toyota dealer and told them this and they laughed and said the 4Runner 4.0 V6 is designed to run on 87 octane fuel.I checked
fuel mileage with a calculator and low and behold 22.1 mpg
right off the bat.I usually can beat the sticker highway rating.
If you don,t believe me,next time fill it up with 87 octane fuel and zero out your odometer and tell me what you think.
 
I've done a small sampling and running 87 or 91 made no difference for me. Also, running in 4WD for a few tanks made no huge impact either. I've been getting an avg 17mpg in the DC Metro traffic so I can't really complain...
 
I do mostly highway driving because I've been in rural areas for work. Where I'm at 89 sells for cheaper than 87 due to the cheap ethanol in my neck of the woods that's added to 89 octane fuel. When in St. Paul I use 87 because that's the cheapest, and I noticed no difference in fuel economy. For me its the weather. This winter I was lucky to clear 18 mpg but now I regularily get around 20 mpg +-2. Like sharp, 4wd doesn't seem to make a large difference for me, nor does using A/C. Mainly I drive slower because of high gas prices.
 
TheBlueWave said:
I do mostly highway driving because I've been in rural areas for work. Where I'm at 89 sells for cheaper than 87 due to the cheap ethanol in my neck of the woods that's added to 89 octane fuel. When in St. Paul I use 87 because that's the cheapest, and I noticed no difference in fuel economy. For me its the weather. This winter I was lucky to clear 18 mpg but now I regularily get around 20 mpg +-2. Like sharp, 4wd doesn't seem to make a large difference for me, nor does using A/C. Mainly I drive slower because of high gas prices.
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Same Here I drive about 60/40 Highway/City. I average around 20mpg or the equivalent of about 440 miles to a tank!!!! I am amazed that this baby gets that good of mileage!!
 
Ethanol will make it worse

Remember that if you are having to use a gas/ethanol blend, you will get let mpg. Ethanol is considerably less efficient than standard gas.

Paul Caldwell
 
Re: Ethanol will make it worse

Paul2660 said:
Remember that if you are having to use a gas/ethanol blend, you will get let mpg. Ethanol is considerably less efficient than standard gas.

Paul Caldwell
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I agree, that's why I'm impressed with the mileage I've been able to get.
 

Ethanol has a lower BTU content than gasoline (or diesel, for that matter), so the miles per gallon figures may drop just a bit. Most stations around here have a 10% ethanol blend {E10}, but it may vary in other states.

On the positive side, ethanol has a much higher octane rating than gasoline - so some of the knock may be eliminated. Then again, do the oil companies just use a lower octane blend when they know ethanol is going to be added to the mix?

Whatever you run in your 4Runner, 22 mpg is excellent. The hardest part is trying to keep the darn thing under 70 mph on the highway.
:bash:
 
The one thing you have to take into consideration is if you have a remote starter. My MPG is far less in the summer and winter as I start my vehicle early to either get it cooled down or heated up. When I use that I get about 15.5mpg and I am running a V8.
 
I think I will stay with 89 octane for the next fill up. 91 octane seem to be working well, but it cost 20
 
Also, remember when you switch octanes, you need to reset your ecu, as it has adjust timing based on your previous octane.
 
blink said:
Also, remember when you switch octanes, you need to reset your ecu, as it has adjust timing based on your previous octane.
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The ECU should be constantly monitoring and adjusting timing...??

I have been logging mine pretty much religiously since I got it. I get almost exactly 18MPG in town 100% and 23MPG on the highway.

V6 4WD on 87
 
spud72 said:
The ECU should be constantly monitoring and adjusting timing...??

I have been logging mine pretty much religiously since I got it. I get almost exactly 18MPG in town 100% and 23MPG on the highway.

V6 4WD on 87
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It does adjust timing constantly, but it will set max thresholds that are determined by knock (lower octane needs less advancing of timing to reach knock then higher octanes).
 
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