This is very inaccurate. Both cars can and could be ordered with varying trim model setups( interior/exterior/interior upgrades), do yourself a favor and test drive as many different trim optioned of both as you can. The 5.7 is no slouch in either, but both 6 liter engines are great. If you don't want to do a bunch of work to go fast, get an SRT. Fuel economy will vary based upon driving conditions. The charger I had, 5.7/2012, avg fuel economy was 29mpg, many long trips at 32mpg. The SRT will sip more.