Taking a look at your file, yes, the tentative minimum tax being greater than your regular tax is the reason that your Alternative Vehicle Refueling Credit is disallowed.
Look at lines 16 and 17 on Form 8911. Line 16 is for the net regular tax (after other credits) while line 17 is the tentative minimum tax. If line 17 is greater than line 16, then there is no credit calculated.
@Markpbrill
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