True, with gasoline so incredibly cheap right now, the difference is almost nothing. Gas is so cheap right now, nobody cares. However, never under-estimate the ability for things to change suddenly. Complacency leads to unhappy endings and I don't expect cheap gas to last for long. All it takes is one major Middle East war (which is likely if the conservatives sweep the House and Senate) or one major U.S. refinery to be destructed by an earthquake and you could be staring at $6/gal or even higher. I live within 30 miles of 4 major West Coast refineries, all of them are ancient and all of them are subject to cataclysmic earthquakes exceeding 9.0. Nothing survives such a quake. When the big one hits, all 4 of these refineries will be off-line for YEARS! They will not all be rebuilt and the era of cheap gas will be over for good. An earthquake may be the least likely cause of the end of cheap gas in America but it would certainly be the most sudden and most dramatic. War is more likely and Americans have a nasty habit of electing politicians who represent the interests of the oil/gas industry. But the oil/gas industry doesn't want plentiful oil/gas because their profits are higher when they control a resource that is scarce. The oil/gas industry LOVES war. Warplanes burn TREMENDOUS amounts of petroleum products and instability in the Middle East makes the resource more scarce which increases profits.
I lived through the gas rationing of the 1970's, it wasn't pretty. When gas prices spike, fuel efficient vehicles APPRECIATE in value and the value of gas guzzlers plummet.
Don't let years of gradually declining fuel prices make you complacent. It won't last.