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13 Challenger RT, 11 CTS Coupe Premium, 94 Eldorado (RIP)
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reco2reco said:
I took the car to the highway and had it in 2. I increased the speed to about 70mph for 4 mins then let it come down to around 30 mph, then again up to 70mph holding it there for 4-5 mins and then back to 30. I did this for about 15 mins, there was no black smoke from my car. I did burn lot of gas...

I bet it did burn some gas. Floor that pedal. It will only take seconds to get to 70-75. If you were there for 4 minutes you weren't giving it to her. Let that north* have it.
 
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