Fuel efficiency mods

[why?]

Originally Posted by MadMax

I think better MPG is more of a factor of how you drive than how the car is modified...

Up to a point, but you can absolutely modify a car to get better gas mileage. To think otherwise is to say the engineers are wasting time putting cars into wind tunnels.

And low rolling resistant tires should absolutely get better gas mileage. As was said, less friction means better gas mileage. Whether you think that is worth it for what they cost is another story.

Tires can have a massive effect on fuel economy, my new tires were hitting 5mpg more than the worn tires I took off.