My friend has a '97 S-15 GMC that was a gift from one of his regular customers--when it needed a clutch and other minor repairs,the owner decided to get another larger full sized pickup,as the S-15 was a bit overtaxed using it for his roofing buissiness,he was always loading it to the hilt..it has a 5 speed & a 2.5 4 cylinder motor ,it goes pretty good for a small engined truck,gets at least 25 mpg and after he replaced the clutch and other parts for about 500 bucks 3-4 years ago,he hasn't had to touch it,other than oil changes and brake pads...
I will agree the S-10's aren't the easiest trucks to work on though--and many had some issues with the "fuel spider" and pressure regulators buried under the intakes on the V-6 engines..sucks putting a starter in one too...I think the 4 bangers are better than the early V-6 ones were...The Ford Rangers seemed to hold up better with a 4 banger too,and got better MPG than the 4.0 V-6's did..