Most toads track really well regardless of method (4-down, dolly, etc.). (There has been occasional discussion about the dreaded Jeep "Death Wobble" but I think that applies to just about any solid front axle vehicle.)
MPG isn't affected as much as you'd think (an additional 4k on a 20k vehicle isn't really that noticeable). You'll find a greater MPG variation between 60 mph and 70 mph than you will between towing and not towing (You're driving a brick in the wind: air resistance at speed provides more affect on mileage than a vehicle in the negative pressure zone behind the RV).
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