Realistically, I don't think spacers will save "save you countless mile per gallons and allow you for alot less down shifts", which implies a large amount of savings. However, the idea of better handling so you can corner faster (assuming that visibility and safety allows it) is good. You might want to concentrate on the front end.
On the rear of most FWD cars, spacers won't help your handling and may hurt your FE by sticking the wheels out into the air flow. I've never driven a FWD vehicle that oversteers (without too much purposeful effort); the rear wheels never even slip a little. The exception is my VW, which usually understeers but can oversteer without being done on purpose (this has only happened to me a couple times).
If your FWD car does oversteer, you may have something wrong with it. Assuming that's not the case, there are additional things you can do besides wheel spacers:
- Wider rear tires
- Increase inflation (if you haven't already)
- Camber adjustment
Those adjustments will keep more of the tread on the pavement during a hard turn. Just remember that the spacers, camber, and wider tires will make you look like a ricer kid and will attract cops to ticket you for those turns...those tickets cost a lot and don't help your FE at all.
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