Vodka is an interesting term...it can mean different things to different people. I make my 95.5%ABV as a neutral and consider it a vodka. The wash recipe is pure cane sugar with tomato paste as a yeast nutrient. -- I strive to drive ALL flavor out of my distillate (tomato paste flavors do not come through);This is important to me whether I am drinking it...or using it as a solvent. People can make Vodka out of variety of grains/potatoes...and even milk sugars (believe it or not). There is a trend to infuse various grain flavors into vodka, and it is worth noting that certain cultures that distill their vodkas take GREAT pride in their unique flavor. Again, this is not for me...I like my vodka flavorless...
One important thing to consider -- Some vodkas/grain alcohol distilleries will add various additives -- vegetable glycerin is an example and is used by some to impart a mouth feel for the consumer. You can well imagine what that would do if you choose to use this as a solvent...YOU would be delighted with the yield(imagine what 2 tablespoons of glycerin would do-- you get the point) you would be disappointing in the product.
A while ago, I emailed Luxco(maker of everclear) -- just to be certain that their product is a advertised -- nothing but grain alcohol -- they never responded. I doubt they add anything post distillation...I am sure people would be complaining if they did. Since I make my own, I lost interest in pursuing it.