Check tire pressures and rebalance tires first.
Tires perhaps? My 95 Villager would start vibrating right around 70 mph. When I replaced my rear tires the problem went away. The tire tech said that one of the belts had snapped in the tire. It runs great now.
No-
I have a 1999 Mercury Villager Estate, with the 3.3 liter V-6. I don't drive the van only in town, I have about a 10 mile trip at 55 - 60 mph to and from work, with some other short trips. I average about 17 mpg doing this, on the highway I get about 20 mpg. Hope this helps.
check front axle bearings.
replacing mounts on 1994 dodge caravan
Tires or wheels out of balance?
Balancing of tire/rim.
Usually seems to be at about 45 mph
I would have someone check your timing chain a certified mechanic if you can get one
vibration on toyota corolla over 50 mph. when taken foot of gas its normal
I am assuming its your car that you are driving. Your wheels or axle could be out of alignment.
A little vibration is normal when your doing 70. But if there's quite a bit, you may have an unbalanced tire.