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uh the instant and the DIC will never be correct. It's an average from the miles you have plus its very inaccurate. only way to get true is to calculate it at your fillup yourself.

l67 cars all have minds of their own. they all run completly different, react to mods differently, get different mileage. my 99 GTP ran extremely well, and got much better mileage then my Regal does,...

mixed/city i get 18-20. highway i've gotten as good as 30, but consistently in the 27 range. depends on how nice i'm driving

if they're been modded at ALL, the trans will take a poop at or around 100k. period. Some cars will run with little Knock Retard(KR) problems on 89 and below octane, but some run terrible. only way...