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Going from sea level to 4400 feet has hurt my milage quite a bit, a solid 2 mpg just vanashed.
If you had a turbo diesel the effect is rumored to not be as bad.
Diesels run most efficiently when you stuff as much air mass as possible into the cylinders as possible, that is why EGR and warm air intakes usually hurt miliage but cold air intake or water injection help milage.
When your cylinders are not filling with as much air you get to burn more fuel to do the same work, I get high EGTs just doing normal stuff above 4000 feet.
In clovis there is about 12% less air up there than at sea level.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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