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It'll also depend on your driving conditions. If you drove mostly on flat highways, and didn't care how long it takes you to get to cruising speed, you'd probably get slightly better mpg without the battery. On the other hand, if you drive a lot of hills, the battery allows you to recoup energy that'd othewise be wasted, so improving mpg. With the Insight, for instance, I can do maybe 1000 vertical ft of mountain at 50 mpg rather than 30, and if the mountain roads I typically drive were only that high, rather than 2500-4000 ft, I'd do a lot better on mpg.
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