I have no idea how much % drop MPG "winter gas" normally delivers.
We have two cars my Miata 92 Auto DD and my wife's 2001 Toyota Echo 5sp. As we
know from this list helping me, my car had a bad TPS and that resulted in 20MPG
from my usual 28MPG. I fixed it and got 26MPG with the first tank, but now
that has dropped to 23.5MPG for 3 tanks of gas. Normally I would chaulk this
up to possible addiational issues. I have no CEL but the car does have 211k on
it and a number of things could cause suboptimal performance.
But my wife's echo also has poor MPG and that happened last fall. Her car does
have CEL but it codes out to a common (for the echo 1.5l) evap control/ pcv
issue that can be hard to resolve. I dont think thats kicking a 40MPG car down
to 32ish MPG.
Is it possibly winter gas, or perhaps something else with auto fuel? How have
the power cars been with detonation lately?
-Chris
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