I'm currently running Spar<->tan tuning on my 2011 F250. If I'm running below 45 mph I can squeak out 20mpg as soon as I get on the interstate it drops to 18 mpg running 67-68mph. And anything over 70 is like watching the wallet drain. Is there any options to get better fuel economy using tuning only? I understand I can get better economy by swapping the read end to a different ratio but a little out of the budget. The tune I'm working with is the 200hp QR tune.
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