However, you can expect city fuel economy to be in the low to mid-teens MPG (miles per gallon) and highway fuel economy in the mid-to-high teens or low twenties MPG. You won't find a precise number because EPA estimates from that era weren't as standardized and precise as they are today.
To find a closer estimate for a specific truck, you could try searching online for owner reviews or forums dedicated to 1988 S10s.
