Best magnum MPG?

Infecteddog said

Do you lose .5-1mpg when you bring the family on a road trip compared to driving by yourself? Extra weight, more effort, more fuel consumption- but in practical application it doesn't act that way. I have never personally observed that kind of a change, I've always seen it relatively the same in similar weight brackets despite 100-600 lbs difference.

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I agree real world gains are small that's why it's not worth spending too much money on improving fuel mileage it's hard to recoup the cost. But weight does make a difference especially intown driving. The resson gains aren't huge cause for huge gains percentage wise is actually small in actually mpg numbers.

My 5.9 jeep gets 12.5 mpg average. I would imagine it would at least get 15 mpg in my cuda that's a 20% increase but actually equals to a 2.5 mpg increase and that's a 1500 pound difference.

All I was trying to say is it takes a certain amount of hp (fuel) to move a certain weight and aerodynamics that's why I said ultimately. Over 20 mpg in town would be hard and expensive.