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Man you have so many options. Keep the Impala. There's tons of stuff you can do to the 3.8 gen III series v6. The final drive ratio on some of those is 2.68:1. At the least do a warm air intake that's high flow.
Don't run ethanol blended fuel and put some synthetics in the car. Get Amsoil low viscosity atf for the transmission or Valvoline MaxLife ATF from Walmart - it'll be a massive difference. Do the same for the power steering pump.
For mods go with lighter wheels (alloy vs steel) and find some low rolling resistance tyres like the Nokian WRG3's which don't compromise on traction.
Get frameless wipers as they will create less drag. Remove any roof racks or hood/window deflectors or mudflaps that increase your frontal area or create more air turbulence.
Get a set of Cree LED headlights if you do a lot of night driving or driving in winter. Saves a lot of amps. Cheap on aliexpress @ $32 / pair.
Finally build a belly pan out of coroplast. It doesn't have to look like an ecobox to run like one...
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