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Old 12-06-2009, 11:06 PM   #1 (permalink)
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What do you think is the "smartest" mod?

I want to know what you guys thing is the smartest mod for your car. The mod that cost the least, and does the most. i.e. grille dam, block heater, etc

EDIT: Smartest mod, not adjusting the nut. I guess this part of my original post got deleted.

Last edited by MadisonMPG; 12-06-2009 at 11:30 PM..
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Old 12-06-2009, 11:23 PM   #2 (permalink)
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Upper grill block, without a doubt -- it added ~10% to the FE and was about 10' feet of tape.

[Edit: of course the free things are excellent value! Driving techniques and pumping up your tires are both nearly free. For air pressure, you either have to pay some quarters every time, or you buy a good pump -- I got a very good hand pump. And stopping your engine at stop lights means that you use the starter more...

Brakes are use 'em or lose 'em: if you don't use 'em often enough, they rust away!]
Sincerely, Neil


Last edited by NeilBlanchard; 12-07-2009 at 09:59 AM..
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Old 12-06-2009, 11:26 PM   #3 (permalink)
needs more cowbell
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Adjust the nut behind the wheel.
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Old 12-06-2009, 11:28 PM   #4 (permalink)
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adjust the nut behind the wheel (2) nt


1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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Old 12-06-2009, 11:28 PM   #5 (permalink)
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Grill blocks are definitely a nice improvement for aero and faster warm up, but i also think an engine block heater makes a nice difference as well, especially in this cold weather.

Corolla aeromods thread:
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Old 12-06-2009, 11:29 PM   #6 (permalink)
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Crap, some of my post got deleted. Guys that said, adjust the nut, read the new post.
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Old 12-06-2009, 11:31 PM   #7 (permalink)
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"Adjusting the nut behind the wheel" and commuting route adjustments. Both were free. Between those mods and drive train break-in and tire break-in, I've gained close to a 20% increase in FE with my Mustang over 20K miles.
Fuel economy is nice, but sometimes I just gotta put the spurs to my pony!

Originally Posted by thatguitarguy View Post
Just 'cuz you can't do it, don't mean it can't be done...
Originally Posted by elhigh View Post
The presence of traffic is the single most complicating factor of hypermiling. I know what I'm going to do, it's contending with whatever the hell all these other people are going to do that makes things hard.

Last edited by Mustang Dave; 12-07-2009 at 10:36 PM..
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Old 12-06-2009, 11:58 PM   #8 (permalink)
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My Grille block was my best improvement besides the 3Tech economy cam and gear.

GeoMetroforum.com - got mpg?
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Old 12-07-2009, 02:11 AM   #9 (permalink)
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Smart driving gave me the largest improvement by far. As for "technical" mods, the best gains/price ratio is inflating the tires to MAX-10%.
e·co·mod·ding: the art of turning vehicles into what they should be

What matters is where you're going, not how fast.

"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell

Piwoslaw's Peugeot 307sw modding thread

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Old 12-07-2009, 03:54 AM   #10 (permalink)
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I would have to say running one size up on tires w/ 44+ psi. The 255/45/18 is 3.15% larger than the stock 245/45/18. Price is almost identical. I spend 60% of my time on the road. So the larger diameter helped the mpg without any real sacrafice.
runner up is grille block.

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