[citizen]

...as it would require an infinite amount of energy to do so, given that mass increases to infinity as objects approach light speed.

Yes....this must be why my car travels many fewer miles/gallon at speed 120 than at 40 ;)

[ETL]

this must be why my car travels many fewer miles/gallon at 120 than at 40 ;)

Yeah, but at least you've aged more slowly in the process. Einstein's theory also states that clocks in motion tick out time at a slower rate than static clocks.