Garth, I agree. When burning the grape, I will often smell the fumes at a light, depending on the wind direction. The fumes flow under/around the car & back up through the windows. The fumes, at least the strong fumes, come from the end of the tail pipes not the engine compartment.
Regarding the fragrance, you only need to use about 1/2 the bottle or 2 oz per full tank. The manufacturer would like for you to use an entire bottle but you really only need to use 1/2 for the full effect. $9.99 is the average price. Check your local speed shop or http://www.speedwaymotors.com/p/1656,58_Fuel-Fragrance-...mNo=fuel%20fragrance
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