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I advised not use too much oil in diesel it will made engine running HOTTER which isn't good when work or long drive.
My experience on 1987 F250 2wd with 6.9L IDI. I put 3 gallons of used diesel oil from 2000 F350 powerstroke. It was 15w40. Big mistake in winter it actually harder to start with thick oil and Not had great acceleration But I went to diesel station to put tank to FULL I think 10 gallons something to try thinner oil.
When outside were 74oF I dump like 5 gallons of gas engine's oil it used. I notice funny when drive 55 mph for 20 miles it start raise coolant temp higher than I like. If I floor pedal it WORSE.
It oil that had btu were higher than Diesel. I think it was 20-50K difference.
On mileage I would say little improve if mix with oil.
On your issue with fuel starve. STOP DRIVE!
My cousin with 2000- Dodge 3500 with cummin 5.9L He had fuel pump out while drive. It kill injector pump. COST $1600 for injector pump because $50 fuel pump stop work. He say it was fine until he notice little power loss it DONE it wear out piston in injector pump I believe.
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