Easy fix, change the gear…
Easy fix, change the gear ratio. Rule of thumb you change one thing and be prepared the change others. I own and older pickup with a mix of Toyota parts from 84-2004 lifted and larger tire and have no problems getting 20+ mpg on the highway, but that in it's self wasn't the goal. That wasn't the goal I had with my 50 year old muscle car either so who's really counting when you modify your vehicle.