I've been using E85 for a few years in 2 FFV, they(gas station or E producers) price it to match energy at best IMO almost never better & it irritates me. Last station I drove by today had 3.86 E0, 3.00 E85(e70?) (22% cheaper, 28% less energy content). In Stratus blends run almost prefectly per energy balance, just not worth the effort to put E85 in as it doesn't save me anything per mile. I tell my wife if it's 20-25% less range to use E85 in the Impala(or Suburan before it) but some how it's almost always empty when I get into it.
The suburban(2002 suburban on fuelly) beat the energy balance, not enough data on the Impala yet.
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