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Only FE EGR experience I have indicates that EGR is worth 2 mpg on a 20 mpg car (10%). (Eliminating EGR drops it down to 18).
That said I Just had a Record Worst tank. 41.5 MPG Towing 100% of the time, mostly highway. About 300 Miles towing 1000 Lbs Lawn tractor, about 100 Miles towing Tower sections (maybe 300 lbs; but tons of aero load); About 100 Miles towing an empty trailer; and about 250 miles pulling my boat.
Still about double the FE of the Supra (MKIII) I'm driving otherwise.
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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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