Mission Car needs time reductions with each upgrade.
I've seen several comments about gas reductions to 5 minutes per refill, and I would totally support such a change. That said, I don't mind earning this change if it were possible. Something just seems off when you start the game and can have a full tank of gas in an hour but as you progress and upgrade it takes longer and longer to reach a full tank all the while you have to use more and more gas per each mission. I would greatly appreciate if the Devs would at least consider the thought of reducing gas refill times with each upgrade of the mission car. I don't care if it's 15 seconds or 1 minute per each upgrade, anything is better than the current situation. Upgrading you mission car to level 8 and having the ability to store more gas but still have to wait the same length of time as you did when your mission car was at level 1 per refill...well, just seems there is room for improvement in this area.