^ This.

 

All the above and my personal favorite taller gears. A set of 3.90s drops the rpms on the open road nicely.

 

3.63 gears fit and that would be good for mileage. On the track you would have to see what gear(transmission) works, but most likely just the first 3 gears.

ROD

 

With those tall gears I'm more than positive the engine will fall out of vtec between shifts at redline.. Which is totally opposite of the reason why the s2000 came with a 4.10 final drive..

 

Definately don't want shifts near redline to drop out of vtech. This is also going to be a heavy track racer, so I really am valueing performance over mpg, but I like better mpg too :-D.

I like to shift just a wee bit before red line (200-300 rpm), mostly because I feel like shifting while its red-lining could have adverse affects on the car, not sure if it does, I just get the feeling it would.

 

The car was built for it.. 2/300 rpm doesn't matter as much as you think..

You're going to beat on the car more taking it to the racetrack and running the course with it than you would by shifting it at redline.. There's a limiter in place for a reason..

 

Wrong. The transmission ratios are not being impacted.

 

You're not likely to do anything that will increase mpg significantly. The most significant modification mentioned in this thread would be the 3.9 final drive gear. That would definitely net some improvement in all driving situations, however it would also significantly hurt acceleration. Remember what kind of car we have and what the purpose of this car is. This mod doesn't make sense unless you are running a 500+whp car and then you obviously don't care anything about gas mileage.

As far as intake/exhaust/HFC/TP - all of those things are going to help breathing efficiency. Will they improve gas mileage? Marginally. Getting your car electronically tuned with these mods is going to net the most benefit. However you are looking at $600 for a flash pro, $200+ for a tune, and at least $1000 for intake/exhaust/HFC combined. That will give you a nice little boost in performance and might get you 1-2mpg if you can resist the urge to drive it like a madman (good luck).

The problem with that is that after $1800 in mods, it's going to take you nearly 150,000 miles to recover the cost of the modifications in fuel savings (at 1.5mpg improvement with $4/gallon gas).

Bottom line, just forget about fuel economy with this car and just enjoy it. Hopefully you have another car that functions as a boring run around car that you can drive when you need good mileage.

 

a non-performance alignment and the least sticky and skinniest tires you can get on there. that will make the biggest difference in fuel mileage in all honesty.

 

This would wreck handling performance on so many levels. Who really wants to do this?