Fat Charlie you must not have any basic understand of how a combustion engine works... which explains your duct tape and card board "modifications".
When you increase the efficiency of how a motor runs, the mpg increases regardless of how you drive.
For the VW's with the ALH motor, it is well documented that if you install a bigger turbo and injectors (with the correct supporting systems like FMIC, etc) this will increase the efficiency of the motor. The increase in forced air at the right amount coupled with the correct tuning almost doubles the HP and Torque of the motor.
Then after doing those upgrades, WITH A MANUAL TRANSMISSION, you can swap out the 5th gear for a taller gear. Because you have increased the efficiency/torque of the motor it can now handle the increased load of a taller gear.
With this done you can be cruising at 1,500 rpms going 70mph and get 80+mpg. I am not making up these numbers, again this is well documented BEFORE even doing any aero mods.
While at the same time when I come up to Fat Charlie's duct tape/card board car cruising at 50mph Ill drop it into 4th and fly by with the new capabilities of my car. Also I be leaving you a black cloud of smoke because my Jetta will be a 3" straight pipe from turbo down pipe to tip of my exhaust! None of that catalytic converter nonsense.
Fat Charlie how about you educate yourself before making another uneducated comment on vehicles. You can be the most efficient driver but at the end of the day you are going to plateau when you reach the max capabilities of your motor and drivetrain. All the duct tape and card board in the world isn't going to change that.
Fat Charlie you compared building an efficient car to playing the guitar???
TDI's are expensive car to own if you do not do the maintenance and work yourself.
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