exactly why isit wrong to make a decision on this. I myself am wondering how much mpg the 6.1 challenger is getting because if you calculate it frankly 17mpg with mds 5.7L vs 14mpg mds-less 6.1l its a no brainer to go with the 6.1 becuase you arent saving a whole lot going withthe 5.7 which is not the animal that the 6.1 is. so think about the statements you make to fellow challenger lovers looking for help from friendly people who share the same interest in the car. hope this helps mfillini5. a 40k car doesnt mean u have to be loaded with cash to afford the gas. for that get a supercar like the viper which any wealthy person canpay for the 5mpg.