Generally speaking, timing belts should be serviced at 90,000 miles.
The best way to find out the gas mileage on your diesel truck would be to go to the popularmechanics.com website. I don't know which year, make or model this particular truck is therefore the mileage would depend.
Probably the best way to get better fuel mileage would be to get a tuner for it.
You would need to purchase this from a Mitsubishi Dealer.
Considering that a diesel pickup truck can't use gas I would say that there aren't any diesel trucks that get good gas mileage. If you were wondering which diesel truck gets the highest miles per gallon then I would say you should look at the Dodge Cummins diesel.
That depends on your fuel mileage.
Diesel will always give you better fuel mileage as diesel fuel itself contains more BTU (the measure of thermal energy) in a given quantity than compared to gas.So therefore a diesel engine can extract more mileage out of a gallon of diesel fuel as there is more energy to extract out of that gallon as compared to a gallon of gas.Considering this, this is why diesel fuel prices would have to rise considerably over gas before the two would be equal on a cost per mile basis.
If your asking what vehicle or engine get the best mileage, it would have to be either a hybrid/4cyl. compact or a compact turbo diesel 4cyl./manual transmission. The diesel can actually get better economy is certain conditions than a hybrid/gas 4cyl.
Diesels almost always get better mileage than gas engines, some like the Volkswagen diesel are very efficient. The fuel is quite a bit more expensive though so do some math first before buying. Compare the mileage estimate of the diesel and the price per gallon of fuel against the same data for the gas. The best solution would be a gas electric hybrid.
"I wouldn't think the Mitsubishi Raider would be a good first time car, because it's such a large truck. The gas mileage wouldn't be very good, and it may be hard to see around."
did it change for the better or worse? if it changed for the better it could of been bad.
In terms of gasoline specifically, presumably premium gas would be best, although I think diesel is supposed to give you the best gas mileage.
the automobiles found to have the best gas mileage rating according to Kelly Blue Book would be 2013 Scion iQ EV, 2013 Ford Focus Electric, or 2013 Mitsubishi i-MiEV to name a few.