Drafting will have much more impact on a SUV then a litle car like a civic or a cavalier.
BIBI, I'd have thought the opposite is true. To me it seems harder to fit a wider vehicle cleanly into the slipstream. The slipstream gets affected by crosswinds and unless you're on a motorcycle (which gets a great boost and way too high pf a risk) it's difficult to find the sweet spot.
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