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I'm looking for some options on modifications that I can do. Generally any visual aero mods are going to be a NO because she doesn't want any visual differences to her car.
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That kind of limits you.
A larger air dam MAY help, but the problem is you wouldn't know for sure without testing. It helped my Metro,
actually hurt my Prius. Big A$# air dam
really helps a Miata - but it's all about the starting point, right?
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Tire PSI is at 40PSI, will increase to 50 for road trip
Have a Scangauge II in car
Will block off upper and/or lower grille
(Maybe) I'll fold the mirrors while I'm driving
There are some stock underbody panels
New 5W-20 oil (Dealer changed oil, don't know what they used)
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Of course driving style is going to have the biggest impact. Take it easy and stick to the right lane.
Question: have you done the math? Is it worth the time/effort to you for 5k miles worth?
Let's say she's used to getting 33 mpg on freeway trips (it's rated at 29). Over 5000 miles, that's 143 gallons * $2.10 / gal = $318.
Let's also guesstimate the handful of mods you listed are good for 5-10% better MPG. Average it to 7.5% * $318 = $24 in savings.
If I had time, I'd do it just for the fun/principle. But don't spend a lot of money on materials!
Of course the biggest factor is speed.
http://ecomodder.com/forum/showthrea...you-15182.html