about carbon build up

mr kilmer watch ur video said drive at least once per month 30min in highway prevent carbon build in the engine or f

mr kilmer watch ur video said drive at least once per month 30min in highway prevent carbon build in the engine or fuel injector

when driving in D gear 70mph rpm in 2100 with eco on

2014 camry had 6 gears 1,2,3,4,5,6 36k miles now

should i change to gear in 5th rmp 2500 in 70mph with eco off

which one is better or doesnt matter?

                                                                                            ur super fan 
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