Same. Just finished an 1100 mile road trip and averaged 28 mpg. Around town i’m getting 24mpg
PS - i’m also in a 1958, but have added FE sliders and skids
I have been using the AT3’s for years and was bummed when the AT4 came out, thinking they would disco the 3’s. Buddy, who claims to know, says they are different models and not 4 replacing 3. Hope that’s the case.
Also, drove from NoVA to ADK today. 8.5 hours, 1 stop for gas. Averaged 29.9 mpg.