Tacoma MPG Dropped

Asked by Feb 06, 2016 at 01:31 PM about the 2004 Toyota Tacoma 4 Dr Prerunner V6 Crew Cab SB

Question type: Maintenance & Repair

Tacoma only has 91k miles on it. 16 gallon tank. It IS 11 years old, but for
the first 9 years or so, I was always getting 365-385 miles per tank, now I'm
barely getting 330 miles. (I measure at every fill up. OCD :))  Isn't that a big
drop within the last 18 months or so? Similar driving styles, always the
same Michelin tires. Things I have done to the car. -basically all stock
besides K&N Filter which I clean every 20k miles -Replaced Denso 02
Sensor with like kind -Always mobil1 5w-30 Synthetic, with Toyota Filter -
Replaced SP with Factory Spark Plugs - Replaced with Toyota Brakes
-80% of the time I use Chevron Gas -Replaced Front Shocks/Struts(I forget
what they are) -Replaced waterpump and timing belt -Did Seafoam once
like 20k miles ago. 1/3rd in crankcase, 1/3rd in gas tank, and the rest up
the vacuum line.   That's about all I've done to this car since its very
reliable. Just can't figure out why the mileage dropped so much  Thanks!!

2 Answers

4,765

How is the oil consumption? check/replace the plugs if they show Oil, carbon or signs of weak combustion~ set the timing to the most efficient (nearly knockin') spot...never trusted seafoam, perhaps it is just fine, but anything other then the correct lubricants seems incorrect...in my humble opinion~ changed all filters, combustion seems okay...emissions are satisfactory...would have to suggest that you increase the timing till knock~....then back off a scoach~ just one man's opinion~

1,355

You may want to run a check of the computer settings (national auto stores can read the codes for you) Also depending on your part of the country you're in, the new blend of gas with ethanol as mandated by the Federal Government and/or your State may have an effect. Have you changed your usual driving routes? (ie new route to work, more highway than before? more surface street? ) started to keep up with the traffic instead of driving by your speedometer? Heck, I don't know, but just throwing out some variables incase something clicks. Good Luck with this.

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