There's a huge difference between 16 and 18 MPG on these trucks. All I'm saying is that I never see proof. Look at my chart above, even the EPA estimate is well below 20. Those are saying they're getting 18+ probably aren't figuring it exactly but rather guessing based on how many miles per...
Get on www.fueleconomy.com and start tracking your economy correctly. I stopped believing people who say they get 20+ MPG on a 3.4 liter 4Runner.. if it's true show me the proof...
Check this thread:
http://yotatech.com/showthread.php?t=86034
Here's my economy over the last 2 years.
Scroll down on this page for a good DIY write-up on the deck plate.
http://www.top4runners.com/ja/perf.html
and here's a good deck plate to use:
http://www.beckson.com/screwout.html
Ask those questions here... www.bobistheoilguy.com There are actual used oil analysis on that forum with facts rather than preferences.
I forgot to add that I only use OEM filters, you can buy them in a case of 10 for $35 so it's money well spent.
Re: supercharger not less reliable
Not to start a flame war on superchargers, but I would say that the lifespan of a 3.4l is reduced when force inducted. Not to mention the possibility of the supercharger itself failing, and the added stress on the drivetrain.
Go to www.bobistheoilguy.com and ask these questions on their forum. Most of the answers will come from people who have actually done Used Oil Analysis on their engines with different oil/filter combo's as well as different OCI mileage. Asking here is like asking who makes the best tires.
And...