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Welcome !
I always get a kick out of " I HAVE to go 75... It's the speed limit"!
Had a poster claim he'd get run over in Dallas highway if he went 70!
Odd thing...I was I Dallas at the same time .... Never got run over or honked at!!!!
I drive sa to austin to Dallas to Tyler to abiene....Never had to go over 65...never.
1.)So....adjust the nut behind the wheel.
2.) get a gauge go where it's flat. Drive up and down at 50 55 60 65 70. Track your mpg at each now you KNOW what you mpg is at each speed
3.) raise psi to 42
4.) having duals doesn't stop u from having a pan see link in my post
I got 30+ mpg on a trip from Sacramento to Dallas in a 340hp, sub 6sec 0-60, 3890lb Q45 that can top out at 150mph. It was rated 22mpg highway. Avg 63mph and never went over 70mph.
You either want to get better mpg or you don't . 70% is how you drive.
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