1991 Chevy S-10 POOR POOR POOR Milage

Are you having to add coolant? Oil?

I just topped up the anti-freeze but it didn't need much. Oil seems to be holding steady.

Could I assume you take short drives mostly?

A 91 with less than a hundred thousand miles points to that...but may be wrong.

IF I am right, that means the engine may not come to temperature enough to heat up the exhaust and moisture may lay in there. If this happen excessive moisture will lay in the exhaust and produce the white smoke as it heats. A constant rich scenrio not only burns fuel but carbons up the front o2 and converter. Combined, this makes for poor miliage.

We got the car from my dad who did not do too much driving. Now my daughter drives it 5 miles each way to commute to work. I used the car this week and drove it back and forth 60 miles each way and it still started up with a dirty white smoke. 3 trips (360 miles) cost me about $80 in gas. So, where do you think I should start?

80 dollars divided by $4/gal is 20 gallons.

360 miles divided by 20 gallons is 18 miles to the gallon.

Sound about right?

IF so, take a look here:
https://www.2carpros.com/forum/gas-mileage-tips-vf650.html