Apparently the original drove like crap. Too much weight.
That's true of a Batmobile replica tested by Car & Driver magazine. The other cars tested are Starsky & Hutch's Ford Gran Torino, the Back To The Future De Lorean Time Machine, Mad Max's Ford Falcon Interceptor, and the General Lee Dodge Charger.
The Batmobile wins in spite of its performance, just because of the cool factor.
>>oo much weight.<<
I’m thinking the body was mostly bondo and/or fiberglass over the body.