I currently have a 2010 GMC Acadia with a tow package (towing capacity of 5200 lbs). I'm towing a 2006 Outback 26RS. I want to upgrade to a larger tow vehicle, most likely a Chevy Tahoe, not sure what year yet, but with a v8 and a towing capacity of around 8200 lbs. My question is, will I get better gas mileage while towing with a v8 engine vs. a v6 engine? I know the v8 will handle towing better, but my Acadia does a decent job with the towing, although it's pretty close to the capacity for towing our Outback. I just want know if it's worth upgrading if I'm only looking for better gas mileage while towing. I know the other benefits would be better towing and safety since my Outback is close to the towing capacity of my Acadia. But that aside, I just want to know what the other benefits would be of upgrading to a vehicle with a larger engine and higher towing capacity.