I started weekly travel due to consulting and flying every week, for now lets say IAD to DTW. Stying 3 nights a week in a hotel and booking car 4 days a week.
Given my time on road, I wonder how i can best use my stay/travel/car so that i can rackup the rewards.

Current Status:
1) All the flight and hotel and food expense is currently booked on Penfed AMEX (5 X points)
2) Everything else is booked on CapitalOne Venture Card (2X points)
3) All my stays are currently booked at Marriott and fly is on Delta. I get Mariott rewards for stays and Delta skymiles for the flight.
4) I haven't seen any benefit or a good program to stick to a single car rental. Currently i am booking randomly on Expedia
5) While i am at 20 nights this year at Marriott, i am still long way to go to Gold or Platinum to get extra points

Current Milege:
Have around 75k on Delta. But to me it appears accumulation of skymiles is very slow and nothing that i can expect out of it any soon.
My ultimate goal is to book some roundtrip tickets to Asia for my family next year.

With the goal of getting 2 adult and 2 child rountd trip tickets to asia next summer, i wonder how best i can use my travel situation.
Apart from Delta skymiles, i have around 90k CapitaOne miles. Ofcourse my PenFed points are accumulating at a good pace but how would i consolidate all these different to get ticekts for family on a single airline.