Yea, very impressive. I've not yet had that same experience with MPG, but I also don't stay at a steady state speed very often. But overall, I also feel for a high HP car, I'm very pleased with the ~20 MPG I am seeing. Technology has done amazing things for power, fuel economy, and emissions.
Way back in the day, I had a '69 Mustang Mach One with the 428 Cobra Jet engine. It had a Holly 780 double pumper carb & 4.11 differential gears. I got about 8 MPG for comparison, & although it was a quick ride in it's day, my SS would have smoked it under any circumstance. And I complained about that $0.62 premium it gulped which was double the price on premium from just two years earlier...
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