I had a 460 powered E350. About 7 unloaded and high 5's loaded.
I'm going to guess that any sort of cylinder deactivation will never pay back.
How about a motor swap?
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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