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Old 06-19-2018, 11:19 PM   #11 (permalink)
mpg_numbers_guy
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Join Date: Feb 2018
Location: VA
Posts: 1,363

Toby - '13 Toyota Prius C
90 day: 64.01 mpg (US)

Daz - '15 Mazda 3 iTouring w/ Tech Package
90 day: 38.2 mpg (US)
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Adjusting the nut behind the wheel is the #1 mod.
Getting fuel economy instrumentation is the #2 mod. It doesn't have to be a Scangauge - Torque Lite app ($0) + decent OBD2 bluetooth adapter ($22) = $22 instead of $90+.
P&G is the #3 mod. Works best with instrumentation.
Air dam is my 4th best mod, followed by tire inflation. Air dam will generally only help out a lot of the underbody of your car is unaerodynamic (most cars are).
Grille blocking and wheel covers helped some, but tested at a <1 mpg improvement for each at 40 mph. Wheel covers see greater benefit at higher speeds.

Of course there's always the boattail...but then again there are a few of us who still want to use our vehicles.

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2013 Toyota Prius C 2 (my car)


2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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