Looking at the Wiki, it's 2.2 (well documented) to 4.8 %
The wiki will also give you some links to belly pan fabrication threads - one of them on a Saturn SL.
Belly pan - EcoModder
2.2% may not seem like a lot, but try pushing the car that far, or get an extension cord that long
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The original location for the fuel tank is also vacant and I'm wondering if having a large pocket like that near the rear of the car could be slowing me down.
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Everything that can act like a
parachute, will drag you down.
Take advantage of all aero improvements you can, and they'll add up to a serious extra range.
Effectively getting 100 miles out of a DIY conversion is no mean feat.
Many current EVs don't really get that far in the real world.