some food for thought here may be that some ECU/fuel injection/ignition systems work crapily with under 14v. On one of my cars(i believe a toyota supra 3.0 na 5 speed) i took all the accesory belts off to see if i gained any power and the car did not run well at all on only 12 volts. Many misfires and less overall power above 3-4000 rpms. It may be fine at the lower rpms needed for cruising but someone may have more knowledge on this
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