Advise on truck and engine purchase

[sbtrucking]

I am trying to decide on a truck to,

Not to long ago a purchased fedex route that came with 2016 volvo 780 with d13 and I shift, 130k miles, its a nice, quied and smooth driving truck, great when sleeping wile driving team on the road, And than has some things that I hate, like wind noise if you crack the window down a little, doors loud when closing, little wobley on turns uneven road and wind, Front tires wear quick it was on its second set when I git it and already wear on the new ones.

I love my the freightliner with ISX, especialy with the mandate removed, more solid and feel confident on the road, how ever little loud engine noise when driving and not as comfortable as volvo.

However last week I did a mpg test, fueld up in dallas dallas both trucks tuesday morning to the cap, we hooked empty doubles both trucks and followed the Volvo 480 miles to olive branch ms. Both on cruise control 67 half way and than we did 70 mph cruise control rest of the way, when we made it to the yard volvo took 59 galons, freightliner took 66 galons,
Same pumps fueld plus the volvo had around 3-4 hours more idle time, and at times we may have cought some drift behind volvo