Did you trying them separately? As in, would the MAF alone give better MPG or the intake?

Regarding pedal response - have you tried a pedal commander? If so, how did that compare?

I've heard some claim a decent 2-3 mpg gain with a y pipe and a cat back.

Considering I get about 16mpg right now, 3 extra is a nice gain for me

That's an 18% increase.


Also.. Electric Bicycle.. if you want mpg but are too lazy to actually ride a bike.

Thank you. This is what I was looking for.. will look into this.

I am no engine tuning expert… but won’t that just lean out the motor unless you increase fuel for the added air its moving?

Id figure if getting 3 MPG out of the thing was that easy… the OEM’s would have did it for you already assuming isn’t not causing some negative effect as a trade-off.

Leaning it out, assuming it was too rich (which is typical), will save gas.
Adding a less restrictive exhaust could help with taking in more air, since more air can exit - means more power produced. Negative effects would be dBs and potential low-end effects due to due lowered backpressure.

Can only work in open loop. This engine rarely operates in open loop. During warmup, and maybe briefly under fast changing - high revs, and that's about it. So during normal acceleration and cruise, it's nearly impossible to trick the system. The computer will just adjust (trim) and lean/rich itself out based on the multiple O2 sensors for closed loop operation.

too lazy to dig up an old thread but other members have tested that the 4runner runs very optimal even during cold starts. Not pig rich at all.

I ran the intake alone for about 6 months and besides noise under load I noticed no mpg or power change. When the MAF calibrator was installed my mpg change was realized. I don't believe either unit by itself makes a difference tbh.

Just to note the guys at URD have custom fuel mappings pre-installed to the calibrator for your intake / exhaust setup when your purchase. You can always flash these via usb to the unit later if you change your system down the road.

And lastly yes, I had the pedal commander before I modified the intake and MAF calibrator. I ran the PC off after the MAF C install to see the difference. It is noticeable, compared to the PC Id say its like putting the PC in City -2 or -3. Now with both systems I only run the PC in City -2 around town and I find myself accelerating too fast pretty often. Its a great combo although redundant. Nice being able to tune the throttle offroad and when I let someone with a leadfoot drive I tune it down a few notches via bluetooth secretly.

I also bought a throttle body spacer from AFE and Im trying that out now. Absolutely no noticeable changes from the thing but the intake system whistles a bit almost like a turbo

Pretty much this. Any mod that promises fuel gains (e.g., lightweight wheels) won’t pay for itself in terms of fuel savings even if you drive the thing until the wheels fall off.

Get low resistance street tires, air up and try to hypermile lol.

With the government fuel economy standards, there is HUGE pressure on auto manufacturers to improve the gas mileage of the vehicles they manufacture. If it was possible to get significantly better MPG on the 4Runner, Toyota would have put it in.

Thus, there is not much you can do beside driving carefully.

Limit driving to downhill only.

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Actually, I have found that driving only with a stiff tail wind works the best.

I just got 11.5 mpg from Amarillo to Albuquerque with 30-40 mph sustained headwinds. It made my trip to Utah very expensive. Pretty soon the 4R might be a very bad vehicle for me to drive. I'm somewhat considering trading my Pro for a Rav4 Hybrid. I have some very long trips coming up in the near future and $3 and $4/gallon gas prices is getting too rich for me.

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